Comp Cams Thumpr vs. Xtreme Cam Sound Comparison

[@FloorItDuh]

I have a mutha thumpr cam in my truck. Did some other things to go along with it. After 2 years or so now and being a daily it's just nice to have something that has a little more power and sounds good. I'm not really looking to win race's, just have something to enjoy driving that has some character. It took a short time to get used to driving with it on a stock stall but once I did it's not really a problem. Driven it in snow and ice too. It's actually kinda nice to have the powerband the way it is because it allows me to dictate when I want the power depending on how I'm driving. It's just fun enough and sounds good enough that for me it was worth it.

[@rileyenia9388]

mutha thumper is the second one right mid teir

[@gordocarbo]

Get the right converter youll love how it drives SO much better. Stock stalls and lopey cams are a real disappointment

[@hickbone4931]

I hear what your saying. I like a rough cam, but that alone dont win races.

[@magster65]

I know the thumper cams aren't very good but they sure sound good. I'm sure the car is much better with your new extreme cam. Good decision and thanks for the vid!

[@HeyLanny]

Just wanted to say thanks as I am rebuilding my 76 Corvette with 750 double pumper Holley , Edalbrock Performer manifold intake with a 2 in aluminum spacer, 180cc/64cc aluminum heads from Flotek and thought about the Thumper, but after several videos I felt it was also too much. Appreciate how you did flash back comparisons and then even listed what you installed. The array of options across the internet is overwhelming and sometimes confusing when your wanting to up the horse power but only have one shot at it. Again thanks and wishing you well. I have been buying and working with Speedway Motors whose has been great about shipping and support.

[@gordocarbo]

UNless you gear that vette Id stick with a isky 270 or 280 mega cam tops. YOu need lots of torque that thumpr will disapoint

[@flik02]

Nice comparison video. Side note with that Sniper, if you haven't done it, try installing and setting it up for progressive linkage. It is insane, the difference in drivability.

[@Thirdgen83]

It's running extremely rich. That's where the soot is coming from.

[@KGisthename]

Yep its the cam

[@gordocarbo]

@@KGisthename Blowing the intake charge and torque right out the tailpipe lol. But it sounds good so...

[@mlr06121974]

Always buy a cam for the way your going to drive and how your vehicle is set up. Gearing, converter, intake and weight all play a role in it. I love the sound of a lot of overlap but it suffers on the driveability

[@johnk2126]

Man the old thumper cam definitely has a distinctive sound

[@zombieking712]

That's all it is for basically

[@adamstreitz5089]

I have a mutha thumper in a STOCK 454 bbc, with headers, intake. Pulled way harder then the extreme energy cam. I did same comparison. If your not afraid of stall the rattle. Let it thump

[@Jay-fb2lv]

@@zombieking712 not true

[@AB-80X]

@@adamstreitz5089 What was the specs of each cam? Look at it this way. The Thumper is basically a relatively mild intake lobe with lots of exhaust duration and some added LSA to keep things running. So you could get say a 232/246 LSA 112 for instance which will sound pretty rowdy in a 383 for example, but it will be relatively mild. And like most cams with a wide LSA, it will be soft down low and in the middle. High LSA cams like to RPM. Now make a cam that has a 230 intake, but 234 on the exhaust and a 108 LSA, and you can be pretty sure which one will make the most average power. The latter will obliterate the former no matter what you do with gears etc. They will sound about the same, but they will drive very differently, and the midrange punch in the 108 LSA cam will be brutal compared to the 112 LSA cam.

[@AB-80X]

@@zombieking712 It's not all, but it is the main objective.

[@j_johnson_music]

I was checking old dyno sheets from the danger mouse build, this cam is quite impressive and beat out the following 2 larger cams below 5200, in both HP & TQ, and that was in a 9.25:1 350, with stock 194 heads, with roller rockers, and an RPM air gap intake. The test they didn't do was this cam with Vortec heads.

[@gordocarbo]

Tried a low (barely 10-1) build like that yrs ago and was disappointed. What works on thier dyno didnt add up on the st. Firm believer in compression gears makes all the difference in the world. You can literally hear it in the tailpipe while driving.

[@samiayyat4826]

This is a great comparison between the two cams

[@jonprice9368]

I actually always like the 256H XE cam but something that happens a lot with thumper cams is a lack of static compression ratio. With even the smaller one really needs 10.25:1+ on a sbc 350. If running your dynamic compression will be really low and if will feel sloppy and sluggish. It will also will be a lot harder to tune. The XE256H is great for a 9.5:1 sbc 350. Like most flat top with valve reliefs will make.

[@gordocarbo]

256 was a way better choice for him....thumpr, bootlegger etc need compression lots of initial timing, gears, stall to even work. Sad so many choose cams by a video and have no idea that most times they will be driving a turd .

[@jonprice9368]

@@gordocarbo yep agreed always check your squish and your dcr before you buy a cam

[@t.j.johnson1697]

The thumper sounds much better, but the extreme energy will have better performance.

[@Jay-fb2lv]

There has been dyno comparisons done by one or two of the engine masters guys. The thumpr cams surprisingly made a small bit more power and torque than the extreme energy series. Kinda surprising I know.

[@brendanscott5023]

I would think the thumpr cam would make most of its power in high rpm

[@Jay-fb2lv]

@@brendanscott5023 it tops out at 6200, it has a nice broad torque range surprisingly.

[@Anarchy-Is-Liberty]

All things being equal, the "thumpr" cam will give it better performance!! It has more lift, more duration, and will raise the power ratio. More air/fuel mixture in, means more compression/power out. Unless he's got a stock converter, he will gain more performance from the larger cam.

[@AB-80X]

@@brendanscott5023 It rally depends on your engine. But wide LSA cams which the Thumpers usually are, like to RPM.

[@americanfreedom1]

I'm running an isky 137F solid flat tappet in my flat top 40 over 327 with stock 58cc 305 heads and it runs awesome from idle to maybe mid 5k before the heads give out. It's a 230@50 480 lift advertised but the lash is 14 thousands so it's more arou 466 lift. Slight lopey idle, good on fuel, holley 670 and runs really good. Lites the tire easily from a dead stop and hits 2nd and 3rd real hard too. It's to easy to go big on a cam if you're not careful.

[@gordocarbo]

Havent heard of that grind in many yrs. Sounds similar to the hyd 280 mega cam Small solids most never even heard of but they are a blast on the st. Best running 350 I had was a 10.3 to 1 350 270 cfm head Isky 280 mega Holley 300-36 and a 650 double pumper. Holy cow that thing litup tires NOW! Even with the wrong 308 gear and a not sufficient 2800 stall. 750 was way too much carb

[@gdaytrees4728]

Thank you for your video. I know now that i want the thumper soundtrack. Music. Sweet violent music

[@gordocarbo]

Use another brand, or line of cams.

[@hickbone4931]

A lot of work went into designing the Xtreme Energy cam. They learned how to reduce lifter dribble using accelerometers, which means you can actually get away with more duration than possible with their other older cams. I ordered a really hot BBC Xtreme Energy cam for a friend, and he called me up pissed because it was hitting so hard. He said, "I only have a 3200 stall and 3.73 gears." This bitch is going to be a dog with my 33" Mickeys. Yeah, he was pissed, but he called me back and said he pulled into the road and stomped the shit out of it, thinking it would fall on its face. He said he hit it, and it blew the tires off. He took it to the track and the car went from 8.90s to 7:40s. The way it was explained to me, by one of their engineers, all lifters jump the lobes and dribble, which basically adds duration and its uncontrolled. He also said the old way of making cams is obsolete. An obsolete design will have the same lift and duration for both intake and exhaust, and there wasn't much thought or testing that went into that cam. That makes sense, because the Intake and exhaust strokes are doing very different jobs. I used to have high praises for Comp Cams, but I continue to read about people wiping lobes during break-in, so dont think I work for them. They need to fix their reputation.

[@castletrash7770]

I like the thumpr sound better!

[@BDauto86]

Pretty obvious where the spot came from. The thumper sounds badass but you can tell the milder cam is more suited for your build, much better drivability on streets too I'm sure.

[@billythomas5616]

Saying one makes more power over the other is not an entirely accurate statement. It depends on where and when you want the power. Thumpers are a great cam if you are reaching a bit higher and have all that it needs to go with it. Calling it a "sound" or junk cam just because most people buy cams these days for that sound doesn't make it so. Comp doesn't make junk. My opinion

[@KGisthename]

These Camaros aged very well.

[@zombieking712]

I just built a 355 Holley sniper Edelbrock intake hooker headers vortec heads thumper cam. Just ordered the xtreme energy cam too. Thanks for the video, I love the Camaro.

[@briandcarey3110]

They don't recommend efi with the thumpr

[@gordocarbo]

@@briandcarey3110 Agree, totally wrong cam for EFI especially throttle body. WAy too much overlap

[@robertjaworowicz2136]

Put the thumper back in .

[@w41duvernay]

Not unless you want to lose power.

[@guitarsandcars2586]

@@w41duvernay let's be honest man with an older car like that sound is always going to be better. That thumper cam made it sound like a real muscle car. Definitely going with that on my small block.

[@Mid-Atlantic_Outdoors]

@@w41duvernay I wouldn't say that. Depends on the combo

[@zanzanman8755]

Agreed put it back on it sounds like true American muscle with the the thumper

[@philipfoster373]

I agree put the thumper cam back in the extreme energy cam sounds like a Farmall H tractor

[@Jay-fb2lv]

I have compared several cams and believe it or not, the thumpr cams do make good power and very strong torque when used with the right compression ratios and decent heads.

[@KingJT80]

and A LOT of initial timing. Ive heard people had to limit their mechanical advance to where they ran 20 degrees or more initial...

[@Jay-fb2lv]

@@KingJT80 not so much really.

[@ZanesGarage]

From my experience with the Thumpr cam the power came in at higher rpm like most big cams. For an average engine like mine I won't rev it high enough to really get all the benefits of that.

[@KingJT80]

@@Jay-fb2lv Well compared to most people who just run 14 15 degrees initial on a street performance cam. its getting up there. one guys said he ran 24 initial and 36 total. cleaned up the idle and he didn't have to jack around with the mixture screws or the idle circuit

[@Jay-fb2lv]

@@KingJT80 that’s because he didn’t have as much compression as he thought he had.

[@aljackson7330]

Why build for sound? Build for power!🏁

[@gordocarbo]

@@evorider3689 You can run a lot less aggressive cam, and get plenty of power and sound. Thumpr is very inefficient. Many cams much smaller do the job better and still sound good.

[@w41duvernay]

ThT why he should take out the thumper cam and put back in the extreme cam in.

[@gordocarbo]

@@w41duvernay Not a fan of those either. Ramps for a ft are too steep imo. Had 3 fail back to back, when they first came out. XFI280 roller, too. Unreal

[@tradmanmike3360]

REALLY LIKED THE SOUND OF THE THUMPER CAM! GREAT VIDEO IDEA! THANK YOU! NEW SUB. THUMBS UP!

[@onefastgmc]

That smaller cam will make more power and enhance driveability over the thumpr cam. That's why I'm going through the trouble of swapping the one in my 383.

[@drdjh2003]

yep. Many overcam and their powerband isn't realistic on the street and then they get blown away from the stoplight with a stock motor. Lighter vehicles get by with it more but say a big car or 80's truck forget it.

[@gordocarbo]

@@drdjh2003 Well said!! Some of the best running st cars are mild torquey combos. Hard to beat overall. Lope doesnt mean fast thats for sure

[@Projects5309]

I just put an same smaller XE256 212°-218@.050" cam into my aluminum head small block Mopar after running a larger lumpy 224°-224° CROWER. Same exact results. The larger lumpy cam sounded great but the overall performance was terrible. An wise man once told me that going to the bottom the camshaft page might look & seem like a good idea but nothing good becomes of it. Fact!! 🏁

[@ZanesGarage]

Glad it worked out good for you! That's good advice also

[@gordocarbo]

Correct. avg st sb, 2teens@ 050 cams usually run best overall. GOod torque brakes easy to tune etc Like big cams too but it needs lots of supporting mods or its just a pooch that sounds good

[@sanchoramirez8357]

That's right don't compromise performance for sound👍

[@bill2178]

the thumper cam story from billy godbold is one of the best happy accidents ever

[@kareemcars]

I have a 86 Bird just purchased compcam, but that thumper sounds badaxx

[@tyranducksworth1913]

Nice video I like that thumper cam had one in my 77 camaro love the idle

[@ZanesGarage]

It is a great sounding cam that's for sure!

[@johnsheetz6639]

Is the vacuum decent?

[@Jay-fb2lv]

@@johnsheetz6639 they have very decent vacuum when you use it with proper compression ratios.

[@davidsnova]

It is a great sounding cam TERRILE POWER LOW TQ.. XE cams work Thumpr cams are only for SOUND.;

[@KingJT80]

They need a a lot more initial timing and compression than people think. its a "big camshaft" the one he had was pretty big and if he didn't have 10:1 minimum its gonna suck. esp on vortec heads. if he had the smallest of the 3 aka the thumpr , it wouldn't have been that bad cause vortecs have sucky exhaust ports anyways so its needs that extra duration

[@desmondpeak9931]

He got to get the 279 thumper cam that the small one

[@ericmuhlbeier8023]

@@KingJT80 what are your thoughts on a thumper in a 5.0 Ford? I have an f150 thats to nice to beat on so it gets driven to go get ice cream and to shows only...maybe deck the heads bump, compression port em to the max?

[@KingJT80]

@@desmondpeak9931 yep

[@falcon6995]

Thumpr cams are better suited to strip and racing applications. They actually make more power on the top end with a wilder setup. On a street setup they make the engine run like a fat pig at low RPM.

[@DoctorWonka]

Okay, the THUMPER sounds nicer. But which cam PERFORMS better? 🤔

[@gordocarbo]

We both know the answer and it wont be popular with novices

[@MrXerxes415]

yall represent exactly what you want!

[@mrbouttabag3995]

Ahhh yes the bliss comments on the KZbin mechanics

[@EverettAdams928]

Use the thumper hands down!!!

[@dustinrowland637]

Great Video.. Get the Camaro Looking as good as the engine you will be the man!

[@ZanesGarage]

Thank you! Some day I'll start working on the body of that thing!

[@lindajones1592]

As much as i love the lope you sacrifice a lot of power to have it. A lot of people think that when they hear a car lope like that it must be a beast when that's so not true. I went with them for years then finally talked to my local machine shop/engine builder and he explained it all to me. I asked him to order me a cam to give me the most torque and low-end power for my stock converter and man its a beast and with hardly any lope. Pick your poison!!!

[@gordocarbo]

@@evorider3689 Last few items most car guys skip or cheap out on. Springs, supporting mods dont recurve the dist and wonder why thier car sucks.

[@richardbates2367]

I had a 355 in a 86 Chevy k20 longbed c6p heavy duty chassis 4x4 farm truck and I had a competition cams xtreme energy 268h cam kit in it 474/480 lift at 221/224 duration and it made plenty of power and decent throttle response even with it running a qjet my choice of carb.. honestly mine sounded more like the thumpur cam you had in your camaro..

[@antilaw9911]

You have the older high energy 268. The newer XE268 has 224-230@50

[@FAFO_86]

Thumpr is 🔥, i have extreme energy in my 406 and it sounds good too

[@derekscarrsr2688]

I have a 350 and three flat tappet hydraulics on hand after listening to your vid I Think I'll use the XE 262 which is the smallest of the three and believe I'll be satisfied.🤔😎

[@davidharrell8890]

I’ve seen cams that work from idle to 5,000 RPMs, does that mean you get max tq right off idle? What does it sound like? Thank You. 💯👍👍

[@antilaw9911]

Yes

[@cecilandrews7479]

And the one was really rattling rough it would probably idle better if you had tuned the carburetor it's obviously loading up

[@jamiehope4580]

Trumper sounded awesome but if you can't build the motor to suit then going smaller makes sense 100%

[@davidandlaurablevins68]

Did you have any problem with not having enough vacuum on the thumpr cam?

[@TerrionCarter]

Get a vacuum canister. I'm running that cam also.

[@ericmuhlbeier8023]

That soot is style bro!!! Keep it

[@gordocarbo]

Too much overlap idle circuit needs more tuning. Have 82 deg overlap 0 soot inside mine

[@chrisanderson6837]

You just sold me. My old car is so heavy I just need the intimidating sound lol at 4500lbs how fast could it be. Sold one thumpr coming up. Little worried about all the lifter failures you hear about any thoughts

[@gordocarbo]

Bad decision, esp for a heavy car. Im one of those fail stories...all same fast ramp cheap core crap. Even a roller went flat. Lope doesnt equal fast. You need torque for that car, easy on the overlap, duration. Youll go faster with going smaller to a point.

[@karlx-1]

MT cam is garbage. It's for show, no go. The XE cam is for people who want to GO! Especially on the street. You made the right, mature decision.

[@ZanesGarage]

I definitely agree with that statement!

[@gordocarbo]

My old 350 made more torque overall power with the smaller Isky 280 than the XE 284. Geared right single patterns hit harder, just choose a realistic powerband. The extra 5-10 lbs you Maaaay get from teh XE isnt worth the accelerated wear on valvetrain parts.

[@davidstrouse4832]

I seen a video where they say the thumper cam doesn't put out as much power and that it is just to sound bad ass, i have a xtreme comp. Cam 480 and 465 ex. Lift, 280 and265 dur. 110 lobe sep. Flowmasters w/ turn downs, the cam is choppy and people think there's a big block under the hood SOUNDS TUFF

[@johnevans1969]

Sweet coming and going! Nice

[@davidjuarez1834]

You ain't making much power with either one but at least the thumper sounds cool.

[@falcon6995]

What would you recommend?

[@RazorUltraPro11]

@@falcon6995 a stock 5.3 lol

[@KingJT80]

@@RazorUltraPro11 you don't need a stock 5.3 lol just put a set of cheap 180cc aluminum heads and flat top pistons in a 350 and a 230s duration cam. Done 430+

[@-OokySpooky-]

Lol last guy said it kinda. Heads, man, heads. Whippy little cams like these aren't bad in any way, give a bit of extra bump in the power but then again so can a quality tow cam, anythings better than most stock choked up cams. The best part is being able to change how the motor acts. But none of it matters for power without heads. Get good heads first and you'll SIGNIFICANTLY increase how much power even a decent little cam can make. Heads are expensive even when theyre cheap, save up for a pretty nice set. Then you can get whatever cam you want and actually see it's gains.

[@KingJT80]

@@-OokySpooky- yeah it always works better with better heads then you don't need as much cam duration.

[@copisetic1104]

Lobe separation is the key to a lumpy sound.

[@boosted.]

Valve overlap is the Cause for a lumpy idol the more valve overlap I.e. duration you have the lumpy it gets, Da dumpity Da dumpaty Da dump Da Dump 👌

[@nsmturbo5902]

@@boosted. you just said what the op said...

[@boosted.]

@@nsmturbo5902 Lobe separation is not duration or overlap

[@nsmturbo5902]

@@boosted. Overlap is the degrees that both intake and exhaust valves are open at the same time. That is determined by Lobe Separation Angle. I didn't mention anything about duration... All I said was you are both saying the same thing.

[@boosted.]

@@nsmturbo5902 true and the more duration the longer the valves hang open and the more overlap you have I guess we agree maybe didn’t understand what each other was saying

[@214deleon4]

X pipe or straight all the way to the flowmasters?

[@ZanesGarage]

X pipe at a little before the center of the car

[@TheUndertoe]

Little rich theee my damn truck loves to run rich all the time gotta love it

[@ZanesGarage]

Little rich is better then a little lean though!

[@TheUndertoe]

@@ZanesGarage true I finally got my truck to run pretty good it’s an old tbi 350 so it hates bigger camshafts but she eats it now

[@gordocarbo]

@@TheUndertoe Engine dont love to run rich...nor too lean.

[@ssdtrain1]

that first "new cam" sounded more like 112 LSA.. Thumper cams are more for the sound, the overlap and grind is the key in their trademark "lope" however Xtreme cams offer more performance. Considering it looks like you run an injection setup, 112 LSA-113 LSA is way better for that motor than 107 LSA or 110 LSA any day. Computer cars have a hard time adjusting to that "unbalanced" idle.

[@gordocarbo]

Smoother cam just has a ton less duration and overlap. Trying to make a cam whose ramp is too quick is just gonna wipe out lifters and lobes..if you need more just choose a different cam or better yet toss a bigger crank in it

[@robertwhitey6621]

The thumper cam sounds great, is that a Comet sitting next to the stand?

[@214mannygarza]

Can I use that thumper cam on a fully stock engine . I just like the sound . It's for a weekend car anyways

[@TL-angzarr]

If you mean does it need to be modified no it doesn't. But depending on the engine you might have to notch pistons, change valve springs or upgrade rocker arms. That being said if it's dead stock you won't get all the sound, exhaust manifolds and restrictive mufflers will ruin the sound. As a side note you might have to change the convertor too, what happens is the new cam changes the torque curve and the car will lock up the convertor at idle and will push through your brakes at a stop light. Not trying to discourage just trying to inform

[@ZanesGarage]

It will all depend on what springs, heads and pistons your engine has mainly. If your springs can handle the lift of the new cam and you have the piston to valve clearance you should be good. Try and get some info on your combo and you'll find the right cam for it 👍

[@cammontreuil7509]

You're the only one here that gets it ? Right. Just fun to sit at a lite and idle. And cruz.

[@TerrionCarter]

@@TL-angzarr correct. I had my thumpr put in two years ago, but with stock springs and stock convertor. My headers were cut open after the y pipe prior to the cam. Even after adding a vacuum canister last year, my car still wants to go when in gear and brakes engaged.

[@gordocarbo]

I wouldnt. it will be a slug

[@anthonymartin5466]

Nice video, I like the sound of the thumper better.

[@wildrosegarage4208]

If you want a good sounding cam that makes wicked power and runs good look into the HOWARDS RATTLER series cams. Night and day difference from a thumper. I have ran tons of different cams in different motors and the howards rattler is a great choice. And I have never had any issues with lobe or lifter wear using howards products.

[@gordocarbo]

Similar approach as thumprs actually. Comp owns them so no surprise theres a new line of cams with a catchy name. Harold B would never let stuff like that take place if he were still around...whatever floats your boat though

[@wildrosegarage4208]

@@gordocarbo How do you figure Comp owns Howards? Because they dont! The rattler series is nothing new its name is from the Howards slingshot dragster that was called the rattler. The grinds have less duration than a thumper and the lsa is on a 109 a comp thumper is on a 107. Howards is made in the USA. I think you are getting Howards mixed up with Crane.

[@gordocarbo]

@@wildrosegarage4208 I said they own lunati not howards

[@clintjohnson4947]

Nice

[@shanelloyd-jones9381]

Can you tell me reason you chose to go from the Thumper to Extreme energy , was it because the Holley Sniper didnt like running with the Thumper Cam , I have 383 with the Sniper and extreme energy cam , I have found with Sniper and timing control alot of the lope has gone from cam , I was thinking of changing to the Thumpa cam but not sure which way to go.

[@gordocarbo]

Its going to be more hassle tuning it. Those have a lot of overlap, not great with EFI. DOnt worry about lope just get the right one and do your tuning

[@albertorodriguez6661]

Im running crane cam 282h06 bad ass cam it just keeps pulling

[@genzbible]

The accessory belt is slipping; that's the sound you hear. Need to micro-align your alternator and power steering pump to your hub pully.

[@ZanesGarage]

Your both right it was an old belt on a misaligned alternator! Fixed now 👍

[@genzbible]

Great job! It should sound real nice now and the tighter LSA will make more power for you.

[@thedarkphire33]

I know I will probably get a lot of hate for this but I wonder how this would do in my l69 305. The tech specs are actually not too far above stock cam.

[@janeandjohndoe8458]

Putting a thumpr in my 408W, on bigger inch motors with good heads it seems to be a good power adder!

[@AB-80X]

There's always a better option for power.The Thumpers are for show more than anything.

[@jakefriesenjake]

I wiped out my solid roller cam and lifters. Not good for street, especially if you don't keep on checking lash and are idling it alot. Engines basically brand new. Now I'm looking for a hydraulic roller setup. That big Mutha thumper sounds badass. I won't be racing my 383, except racing to the fuel pump, so the heavy over lap and duration don't bother me. It's just for cruising

[@irablankenship8423]

I ran a big mutha thumper in my sbc. It was a monster. It was in a 4 Dr. 2wd blazer and it ran 12's on street tires. The cam makes good power it's not only for sound

[@er70nie]

Thanks for the video. Putting a 348(stroked to 427) in my son's 56 Chevy 210 and we're undecided between the hydraulic flat tappet Thumper (.525 lift), extreme energy roller (.548 lift) and a Howard's hydraulic flat tappet (.525 lift). Our compression is 11:1 and running dual 500cfm Edelbrock carbs on an Edelbrock intake. We want "the sound" but not at the expense of losing driveability. Any input/guidance appreciated.

[@ZanesGarage]

Sounds like an awesome build! And i think as long as your comfortable tuning those carbs and getting them just right then the Thumpr cam will give you that classic sound. If you don't want to worry about that stuff then I'd stick with one of the more mild cams. Good luck on it!

[@briandcarey3110]

I went with the retrofit, to many horror stories about ppl whipping lobes off,

[@gordocarbo]

Choose another line of cams then.

[@davelowets]

Lean that thing out! It's CRAZY rich...

[@davidnay9383]

Hey I'm in Ohio to and I'm putting a 350 in mine thank for the information

[@ZanesGarage]

@@davidnay9383 glad I could help! Good luck with it!

[@zackk695]

Write a description on the video when each one runs so we know what it’s is. The first one sounds stock and has no lope to it. The 2nd cam had some lope to it but it still needed a larger cam to have that radical sound

[@ridafatima334]

heyy,,, do you have any idea what is Vortec Head?

[@ZanesGarage]

Yes, I'm running vortec heads on my engine that is in the video actually. They can be great heads I really enjoy mine.

[@gordocarbo]

96 and up 350sbc The old 80s or earlier centerbolt valve cover heads are NOT vortec..nor the 305. Lots selling used "vortecs" that are just crappy smog heads.

[@PuffPastryGarage]

What is your fan set up ??

[@robbiegirosky7055]

Any issues running the holley sniper efi with the thumper cam? Was told their not compatible due to the efi trying to make a smooth idle because of the thumper cam overlap making it basically flood out? I debating on swapping to efi and not looking to swap my new thumper cam.

[@TerrionCarter]

I've seen a couple say it works. Some say it doesn't.

[@TheMikel302]

The less vacuum at idle makes it run higher up on the base fuel table . The map signal will also be more irratic. You can tune around it but it's a lot harder. You can also use ALFA N VE COMBO to get around that too

[@gordocarbo]

Too much overlap, rediculous duration on exh and crazy tight lsa. Not gonna play well with EFI Just put the right cam in there it will run and sound just fine.

[@bubbaparrish1454]

Isn't it the duration that makes the Lope sound you can get a high lift cam and still sound stock

[@ZanesGarage]

Right duration and Lobe separation angle will make the biggest difference in sound and idle quality

[@nashvilleoutlaw]

From my understanding duration will give an engine a choppier sound and poor street manners. But the reason why is intake and exhaust valve overlap. So you can still have a short duration cam with choppy idle. Now the low vacuum from a bigger duration cam comes from when the intake valve closes. Basically all cams close the intake after the piston has already started it's way up on the compression stroke. Intake air still has momentum to force it's way into the cylinder as the piston starts going up. By keeping the valve open longer the piston is able to push air back into the intake lowering dynamic compression allowing you to run higher static compression without pinging on the same octane fuel at lower engine speeds.

[@johnmarzari8104]

nashvilleoutlaw yes what he just said, if you want to get the chop sound better make sure you are running 11:1 or more compression or you will pay the consequences and no you should not run LSA below 110 with electronic injection and all thumper cams are below LSA 107. Most modern fuel injection have LSA above 116.

[@gordocarbo]

No, its overlap. Its the intake charge trying force its way back UP to the carb....trying to make it not run essentially. Less is more on a true st car...lope is wayyyy over rated.

[@marcusnolley8099]

I am looking at buying the same thumpr cam what size stall will I need if any

[@ZanesGarage]

You're best luck would be to call Comp or read around on forums for your combo. I ran a stock style converter with low stall and it definitely wanted more. Good luck!

[@MauricioHernandez-st8su]

Hello buddy. I always see your videos but i don't understand something in this video you say the cam is a high energy but in the description i read its a xteme energy. ??

[@ZanesGarage]

Oh your right! It is an xtreme energy cam the one that i have linked but i must have made a mistake on the intro and said high energy. Good catch 👍

[@timsharpe2419]

A lot of people talk crap about thumr cams not making good power , how did the two compare to each other on the road real driving vs dyno?

[@gordocarbo]

Those two cams are so different its tough to compare. Id take the smaller one all day and 2x on sunday for an EFI driver.

[@drdjh2003]

the thumpers have the sound but often cost HP in many cases. Personally I'd never use one their other grids are better.

[@drdjh2003]

there are . Back when we were kids and people raced cars, trucks outside of our country town if you had a stockish car or truck and stuck a 292 cam in it, no gears , converter it was a dog. The vehicles with dual plane intakes, 268 HE comp cams were always solid performers, and great everyday drivers.

[@briandcarey3110]

Gotta have decent flowing heads, everything has to match up

[@gordocarbo]

@@drdjh2003 True. That 218 high energy or Elgin Isky Crower version is the perfect st perf cam you can drive every day. They will run hard from idle no issues....ramps are not crazy "extreme" so the cams last too. Prefer pre 2000 grinds for most cams

[@albertorodriguez6661]

Thumper cams are good for show cars all they got is the rumble the extreme cam is better

[@Dougarrowhead]

Thumpers are made just for the cam sound. Much better choices out there as far as performance. Friend has one in a 4spd camaro. It chirps the tires idling along in first gear. It lurches forward as it's putting along. The grind on these cams is bassackwards.

[@AB-80X]

Comp Thumper cams is like stuffing your pants.

[@8power857]

🤣🤣👍 so true, if only idle quality was the direct key to HP produced!

[@cowboy2251]

all right. I hope this is the right place. My dad and I are building a 1979 z28 with a 496. any recommendations for a thumpy roller camshaft?

[@ZanesGarage]

I'm not sure what specs are considered "big" for big blocks so I can't really say but it depends on your heads/springs. The more duration, tighter lobe separation angle and higher lift a cam has will make it sound more radical.

[@briandcarey3110]

The higher you go in lift the choppier it will be, I wouldn't worry about the sound, if you're running on the street I wouldn't go much further than .500 lift, you want it to have decent street maners if it's a street car, .500 is right on the edge of ragged, make sure your heads peak flow number top out around the same lift

[@gordocarbo]

Not enough information to recommend anything. Call a long time cam mfr with some old timers who ask a lot of questions before giving out cam grinds...or better yet your machinist will know exactly what will work...internets or guys answering a phone looking at cheat sheets is gonna net you a poor result

[@lovernchristopher]

I want to hear the car next to the Camaro !

[@beller5853]

Looks like a nice ol' Maverick!?!!

[@ZanesGarage]

Maybe In a video some day! It's a stock 302 so it's nothing crazy

[@ZanesGarage]

Nice ol' Comet actually! Same thing though lol

[@beller5853]

@@ZanesGarage My mom had one- hauled ass pretty good with a 302! I was about 10, so everything seemed to be fast- when my brother drove! :)

[@ZanesGarage]

Oh yeah they're pretty snappy that's for sure! I'd love to build one into a real hot rod some day

[@acemaster1001]

hows it on the street? im sure the smaller cams feels faster from idle too 5000. just a guess.

[@ZanesGarage]

Yeah the smaller cam definitely feels faster and much more responsive. I need to hit the track with it to really test it out!

[@DonutGuard]

What kind of vacuum are you pulling at what idle rpm with that XE cam? I'm interested in that cam, or the one right below it which is 206/212.

[@gordocarbo]

It will make tons of vacuum thats a real good torque cam. 206 is a little better than stock but almost not worth upgrading from stock. THat 211ish to med teens @050 kicks butt on most st sbc, Lots of torque everywhere.

[@RAMIREZTX]

I actually have a muthathumpr cam in my 1990 Chevy c1500 and I’m going to back to the original cam. I bought the cam for the hype and it’s not the best with my sniper efi.

[@ZanesGarage]

I get that about the hype. They sound good but so far this new cam seems way more responsive!

[@RAMIREZTX]

Zanes Garage I’ll look into it! I caught wind of your channel from sniper efi videos and I’m staying for the content to come!

[@bradleydennis1263]

@@RAMIREZTX please do not get a mother junker cam. They're ground for sound with NO PERFORMANCE

[@thebigpicture2032]

I bought a mutha thumper for my 83 TA 350/5 speed because of the hype from all the magazine types. Hard to tune, disappointing power with the best sound by far. I’ve had it 10 years but barely drive the car because the power band sucks in traffic. May do this swap but was thinking about going roller.

[@RAMIREZTX]

The Big Picture exactly why I decided to go back to the stock cam. I had it laying around. It only cost me some time but that was it

[@97yawnac]

Thanks for the upload. Just curious, how much time and money did it cost to swap out the cams? Looks expensive...

[@ZanesGarage]

You can get a decent cam kit for a little over 200 dollars and that includes new lifters so it really isn't to bad. Now I replaced my whole bottom end so add in a crank, rods, bearings and pistons (reused the block). It adds up quick but I enjoy it so it's worth it to me!

[@chrismartin6544]

A cam swap can be one of the cheapest ways to gain hp and or torque depending on what your after if you just wanna sound cool the mother thumper sounds great but unless your set up for a big looper like that you won’t gain much power and in some cases you may lose power.

[@joeyhurwitz2930]

Could one install that thumper cam in a carbed chevy 350 without any other supporting mods? I already have a edelbrock carb and head back exhaust.. just want that lope

[@mikekrzeszewski3072]

@@joeyhurwitz2930 yes 100%

[@AB-80X]

@@ZanesGarage No you cannot. The cheap lifters are the worst thing you can possibly use. I've seen as much as 35 hp loss due to crap hydraulic lifters, not to mention the bill down the road when one of them loses a bearing. If you upgrade your cam, getting such cheap lifters is insane. Lifters run in the 500-800 usd range, that's just life. No free lunch.

[@adamscarsncountries7658]

were you running the thumpr cam also with the holley sniper EFI?

[@antj211]

Where are you in Ohio? I'm looking for a good mechanic to work on my 83 MC ss. I'm in Columbus

[@RowdyMornings]

How is that Holley sniper Efi system working for you? Any problems?

[@ZanesGarage]

So far it's great! Ive had it for years now. I had an ECU die a year or so ago on it but after contacting Holley I sent it back and it was replaced and taken care of. 👍

[@briandcarey3110]

Comp doesn't recommend efi with the Thumpr cams

[@nliquide1]

What's the Comet running??

[@ZanesGarage]

Never taken it down the strip to find out. It's all stock as far as I know so it's not breaking in records lol

[@stevereisman6872]

Yeah, the Mother Thumper did sound much better but you commented that it was just a bit too big. Perhaps the downsized Thumper (not mother thumper) would have been the perfect fit?

[@DavidSrSwim]

2500 stall converter, 3500 if it doesn't see snow/ rain. Big lift don't have any bottom end, all middle and high rpm. You get over 500hp, you will twist the body and doors won't work smooth. Lol, been there.

[@falcon6995]

Sounds like somebody didn't have subframe connectors and upgraded torque boxes lol

[@aaronchustz8531]

I see that Comet! 2800-3000lb.

[@ZanesGarage]

I'd love to turn a comet or maverick into a drag car someday! This one is to clean to do that to it but someday!

[@DarthMayers]

I was reading the thumper doesn't work well with EFI. Maybe that's why your performance wasn't 100%

[@joseaguirre7657]

What cam did you use in your car? I have this 204 intake / 214 exhaust

[@ZanesGarage]

Comp Cams Xtreme Energy Cam Part # 12-234-2 Lift: .447 Intake / .454 Exhaust Duration @ 050: 212 Intake / 218 Exhaust Lobe Separation Angle: 110

[@gordocarbo]

Thats the old RV type cam...lil better than stock but not a bunch.

[@theiceman9544]

What lift is the thumpr?

[@rickmiller1425]

Nice Comet!

[@barrywilky535]

Is that about a 72 Mercury comet sitting next to that Camaro?

[@ZanesGarage]

Yes, it is. 72' with a 302 fun little cruiser

[@clintlawson2455]

Had the comp cam in a 455 pontiac bored 30 over with 10:0 to 1 ran like a scalded dog the big cam i tried had no low end torque sound aint everything

[@Dougarrowhead]

I had a blown 83. That unibody didn't like it at all.

[@cfmechanic]

Sounds good both ways honestly I Iove the chop but efi just don't like it. Great comparison vid.

[@ZanesGarage]

Thanks and I totally agree. Hopefully I'll get to test it at the drag strip some day soon.

[@jaedagod9788]

the thumpr one sounds good

[@briandcarey3110]

Comp doesn't recommend efi with the Thumpr cams, says so right on the page

[@cameronpowell8584]

With the holly sniper set up did you have to install a different fuel pump

[@ZanesGarage]

Yes I did I run a walboro 155 I believe. You need to have a fuel system that can run at 60 psi as well as a return line.