Cheap Mopar Modifications! | Engine Masters | MotorTrend

As masters of the Mopar engine, Freiburger and Dulcich know how to exact the most horsepower and torque from stock Mopar engines. Here's what the've done to some pretty basic Mopars on Engine Masters.
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[@rickstrandberg6398]

That insta power initially is what made 383 roadrunners king of stop light racing

[@64fairlane305]

I would challenge you in a Pontiac or a Buick

[@elijah2078]

@@64fairlane305 You would be looking at some Mopar tail lights.

[@Chris-ey6rn]

The stock Mopar with that mild cam was actually pretty impressive . Would be perfect for a low and slow cruiser , that much torque right at the start of the pull it would light up some tires good off a stop light 👍

[@improvisewitme]

I love how Dulcich and Freiburger geek out over the Mopar 383 during the dyno pull. It's so genuine and real.

[@wheels-n-tires1846]

Love 383s.... All my Chargers were 383 cars and they never dissappointed me!!

[@improvisewitme]

@@wheels-n-tires1846 Ok, you changed my mind. The 383 hunt begins!!

[@wheels-n-tires1846]

@@improvisewitme they really are great engines!! And while the 383 is great, dont discount the 400...theyre plentiful and easier to find. Ignore the bad rep they got from being 70s smog motors!! They respond to the internal mods amd bolt-ons the same way, plus the few extra cubes can't hurt!!! Also, if youre building an A-body, they fit much nicer!! Ive got a 400 and trans stashed away now for a future project!!

[@strattuner]

i raced 383's and 440's both,i quit racing the 440 longer stroke engine in favor of the rod stroke ratio 383,i buzzed my 383's to 7200 often using isky cams and quality parts,now that i'm old i've got a dead stock 383 magnum in my 1969 d100 with a np435 truck trans,and 3.23 suregrip,only change to the mag is the carb,i'm like freiburger i like the tq carb for gas mileage,i'm getting around 17-19 at 1800 rpm and all the power i could ever want,bigger tires were necessary,383's 3 million made, parts galore

[@JrGoonior]

@@wheels-n-tires1846 Don't forget, the 400 is the strongest BB Chrysler ever made. Extra webbing, I believe in the crankshaft area.

[@AntiPattern328]

That's what I had in my 77 W200 crew cab. Same cam and I absolutely loved it and it rattled windows everywhere I went!

[@karlmoltzan6196]

You did very good. The stock 440hp musclecar motor was rated at 375 gross hp. The 440 Six Pack was rated at 390 gross hp

[@Ian-of9oi]

When I saw the thermoquad I got real excited.

[@imaouima]

And then... on went the double pumper.

[@311thisfnigguy]

I would love to see you guys do the difference between a 426 hemi and a 426 wedge. Actually been pretty curious about power between the two

[@Wrenchen-with-Darren]

Awsome show, thanks guys.👍

[@jmc2567]

Luv your guys vids,so informative and excellently explained and video editing,cheers,best wishes to all,from,Auckland,New Zealand.

[@johnbehneman1546]

I LOVE ENGINE MASTERS!!!! I LEARN SO MUCH!!!

[@JohnW1711stock]

You guys need to build a Mopar for NHRA Stock. Must retain original cam lift, CR, intake/carb, valve size, head casting, stroke, rod length, for HP claimed, and maximum .070 over bore. A lot of Mopar combinations will run one second, or more under their indexes. A good 1970 340 Duster/Demon fits in E/SA and will run 10.60's! Cool video.

[@dinadaughtry8993]

The horse power is in the block it needs to be 0 decked, line bored to get the bores centered and straight then, you get a light weight rotating assembly and main girdle if you want 650 horsepower in a dependable street car, or no girdle if you don't go over 550 horsepower anyway getting the block decked and line bored to center up the pistons and bring them to the top of the deck will pay off big time

[@Dirthauler65]

I just watched Nick's Garage make 401hp from a Mopar 383 pickup truck engine.

[@johnbehneman1546]

I LOVE IT!!!! I LOVE LEARNING ABOUT MOPAR MOTORS!!!! GREAT VIDEO AND A GREAT BUILD. THANKS FOR SHARING!!!!

[@NDMHUNTER1]

Love these guys ,very entertaining

[@nathanstein589]

With that compression it’s screaming for a big ol turbo

[@FJ80Coop]

Or a huge blower...

[@MrDillon2029]

Right could push quite a bit of boost at that thing with that low of compression!

[@matthewmann8951]

There you go Steve, good job on the cam segment, we want to hear more Mr. D. Thanks guys peace.

[@hemi2468]

I am glad y’all have done motor home 440 test with different heads I want to see Indy or b1 heads on 440 bored 30 over to 446

[@sgas990]

great work

[@ChristopherHayniedd980]

I hope you all are recording Steve. That knowledge is paramount for our sport survival.

[@propdoctor21564]

ThermoQuad !! 😁😁👍👍 This was my favorite carburetor back in the 1980s for my 1972 Duster 340 and also my 1969 Roadrunner 383... I understand carburetors and like working on them so I could make this perform as good or better than anything else.

[@wheels-n-tires1846]

Mine too!!!! Love the tunability and potential of a classic early TQ!!!!👍👍

[@antilaw9911]

I did same. Love thermoquads! Had a few of them. Took the best from each made one great one. Rebuild kit from Nabco. Larger jets. Learned to set up flawless. Ran like a top on my street/strip 440! Had 750 Holley, wouldn't run right would get hot. Thermoquad wasted the Holley. I let that carb go with that engine when I sold it. Big mistake! Now Holley makes a thermoquad reissue. Cool

[@stevea6722]

I like Dulcich's attitude!

[@jy7duality]

Your the man Dulcich!

[@mrwilliams8330]

Motor trend You Tube got you famous. Real Talk. I Enjoy Thank you

[@rustyjeep2469]

famous is relative, I knew of these guys back in the 90s when they were writers/editor(s) for various car magazines can't believe people don't seem to know that freiburger was editor of Hot Rod Magazine and other magazines, and before that he was a writer at those magazines... for many years before Roadkill or KZbin or people having Internet access at home was even a thing. he's been in the automotive media industry since he got out of college... I don't know as much about steve but I know he's been at it for quite a long time as well. not that it matters,I just think it's funny when people think these guys popped out of nowhere and became sucessful all because of KZbin.

[@TwentytenS4B8]

Freiburger has been doing this for well over 20 years. He's not new to the game. Dulcich has been around almost the same amount of time.

[@eric63377]

Sign the RPM ACT petition EVERYONE!.

[@kev-o8791]

This needs a pin

[@SophiaAphrodite]

Why? It is not going to do what you think it will.

[@johng397]

@@SophiaAphrodite You are the first to poo poo the move in this direction. Why Bogard?

[@danrather5473]

Signing a petition isn’t activism.

[@kevincsitley]

Hot Rod Flash Mob on Washington D.C. on a Friday afternoon would get some attention. Signatures won’t amount to much.

[@ronwade2206]

I made $$ as a teenager doing tune ups and I rebuilt hundreds of carbs in the heat of west Phoenix. Thermal Quads warped and cracked, if over tightened lots of carburetor main bodies would warp, Quadrajets and Carter AFBs included. As time passed lots of base plates that required separators got lost and heat risers rusted shut so intakes filled with carbon that was hard as steel. A big block with a properly jetted Thermal Quad made tons of torque and buckets of horse power. Holly's just dried up and crapped the bed in the heat, more than one car caught fire thanks to Holly double pumpers.

[@rickbatey1548]

How about getting an old 400 Mopar and putting in a 440 crank? I’d love to see that. The 440 just had too little compression to do anything. But super charging would help off-set that issue!!

[@wheels-n-tires1846]

Right?? That CR just screams "blower motor"!!!

[@chriswest5360]

Yeah, but those stock cast pistons wouldn’t be able to handle much… which being youd want to tear it down and gap the rings for boost and all anyway (I would at a minimum throw in bearings, rings, new oil pump, and clean and check everything out in an engine that’s going to be beat on, boosted, sprayed, etc.. and with any pistons, stock, aftermarket, or otherwise, you’ll want to gap the rings for boost) then you may as well spend a couple hundred bucks and get a set of the forged speed pro (trw) stock replacement pistons, which are the same weight as the stock pistons, so you don’t have to worry about the balance or anything like that, and then with the forged pistons, forged rods (which all mopars have forged rods from the factory unlike the other brands) you’ll be able to live with a bit more boost..

[@chriswest5360]

The only thing nowadays with the stock 440 crank in a 400 block is that by time you spend the money in the machine work you can get an aftermarket stroker crank.. and then also with using the stock crank, and then buying your pistons, rods, bearings, rings, and the balance job you are looking at the rotating assembly costing more than a stroker kit that’s already balanced (which I would still have the balance and all checked to make sure that it’s good to go)

[@wheels-n-tires1846]

@@chriswest5360 true... Of course youre right about the rimg gaps and some fresh bearings etc. Sometimes low buck is the only way though... Eons ago I built a 440 for my 68 Dart, but no way could i afford new pistons. So after work I milled .065 off the 452s I had laying around. Did spend $13 for the MP porting template, and lotsa hours, but ended up with compression and decent flow for basically nothing. The Dart became my daily for years, and eventually broke into the 11.50s. Of course, being a fleet mechanic for a wood mill with a decent machine shop comes in handy...!!!

[@cromBumny]

It would have been interesting to walk that engine up in Compression Ratio and dyno it for each increase

[@topenddean]

A "Compression" dyno session was done on a 440 and it was found that every point of compression was roughly 15-20hp. Three more points of compression on the 440 could have increased it's output by 45-60hp.

[@Welcometofacsistube]

Love it. I have 14 thermoquads in the shed

[@scottbrown321]

can I have one?

[@fukemallgarage]

Some say when the end of days comes trading thermoquads will be the only way to survive. You sir may be our new king lol

[@davef.2811]

May I have a couple of them?

[@wheels-n-tires1846]

Hero!!! I love those things!!!

[@a456987]

A set of heads would be great on the motorhome engine

[@robertnunziata2950]

That's a lot better stock than I would have thought

[@topenddean]

That's because they were doing a "Gross HP" dyno run. If you add all the front end accessories like Power Steering pump, Air Conditioning compressor, Water Pump, Fan, and the Alternator, the horsepower would have been much closer to what the engine was rated at originally. Mid to high 200hp range.

[@erickanguiano8142]

@@topenddeanthe 383 came with standard 330hp

[@bottomlineoutdoors6187]

I bought a 2008 Dodge Ram 5.7L blown, can I replace it with a 6.4L or do I need to by another 5.7L hemi

[@craigcontofalsky4387]

Good job Dulcich!!!!

[@thisislargemouth5566]

"And it's 7.4:1 compression and there's nothing you can do with that " *18lbs of boost giggling*

[@MoparMan-ff8fb]

i got both versions of that Thermoquad shirts 💪🏁

[@wymple09]

I had a motorhome with the 440 in it. It was a gas hog and a dog. My brother's 454 motorhome made 100 more HP with the same torque, and got better mileage.

[@Arthur-ej5gi]

What's the difference in price for the Xp carb Vs the Brawler they ended up running?

[@bennyboyy7]

155 thou in the hole, i love steves comment about the CR after that

[@jediknight129]

I can see that being a scream for a hot rod for cruising and just enjoying the ride

[@sweettooth80]

Woah. A youtube vid from them.

[@joseortega1114]

When are you going to do a old school 383 chevy stroker VS. Chevy 6.0L LS and both engines had roller camshaft roller lifters roller rocker arms

[@SophiaAphrodite]

My dads favorite engine was the 383 Magnum. He was beating 440's and even Chevy 454's on the street because of it's low end torque.

[@lukepokrajac1057]

Exactly!

[@somebloke13]

Having driven both, my first reaction to the 383 was "Where's the torque?"

[@superkillr]

Your statement has zero mathematics behind it. There's alot of people out there that have built total junk and tried to race it. Doesn't say anything about the quality of the engine in good hands.

[@emilianocruz11]

we need engine masters episodes on youtube

[@telesformartinez109]

Can someone tell how to find out this exact build spec on the 383 Mopar

[@user-np9sl8de8t]

Probably the best jobs ever

[@timmaynor8699]

Old school is still cool.

[@perrosdemaiz]

my favorite show

[@steverundus2878]

I know stroker motors are hot now, but I would love to see a similar episode for a Ford 289.

[@johnsheetz6639]

What's a 302 test it's not that far off 13 cubic inches I do love a 289 though! Specially the k code. I'd like to see what the stock Dyno numbers are with a different intake manifold decent size carb. A nice tuned 1850 model Holley would be sufficient I'm sure.

[@roknroy1]

notice the compression starts at 7.5 to 1 and gradually goes down as the video plays!

[@bw3506]

I think the 7.5 was either a guess or maybe factory stated which were never real accurate. As they went on they actually measure to determine what it was. The replacement head gaskets were also thicker. I didn't go back and actually watch it again but I think I'm close to what went on.

[@sevenpointsixtwo9707]

I’d sell my spleen to get you guys to work on my 440. It needs help…bad. 😩

[@wheels-n-tires1846]

Keep your spleen!!! Those things can be built pretty easy n cheap!!! Last 440 I had took my 68 Dart into the mid-11s with stock bottom end, milled and MP template ported 452s, cam, intake and headers. Had about $3k into the whole car... Ok it was 10yrs ago but still...!!!

[@gordonburnett9672]

Built by Steve a 2 in the morning, still beats anything I could achieve.

[@superkillr]

Nice.. change multiple things at once so you don't know what part effected what. Great methodology.

[@Brotesque89]

"I chose this thing because of the SPECS!"

[@BBBILLY86]

this drives me crazy and never gets answered. Is it Dole-check or Dull-sitch. David has been using both in the same sentence for decades.

[@MellowYe77ow]

His actual last name is Dulcich, and is pronounced the latter.

[@lukepokrajac1057]

Dulcich...a good Croatian boy.

[@large_n_widetm2116]

He calls him dulcheck because his old mentor could not pronounce it correctly, and that is just what he called him.

[@u.h.johansen803]

@@large_n_widetm2116 that makes sense. I do the same to a co-worker (calling him by someone else’s wrong version of his name)

[@johnbecay3859]

@@lukepokrajac1057 don't tell the Serbs....

[@jacksonwhite5663]

Give us back motortrend in Australia

[@themackguyverchannel7713]

The stock 1968-69 440 magnum was rated at 375 HP

[@daviddavid5880]

I hate graphic tees, but.... I'm feeling that "Thermoquad!" shirt.

[@burleigh604]

I did not know you had Robert Duvall look alike working for you

[@josephsauceda9454]

What's the part # of that MSD distributor I as well just bought an OG motorhome 440 out of a 79 sportsman.

[@josephsauceda9454]

Only 40k miles on it

[@sparlin88]

Howdy guys ! I have a 500 hp 440 I'm putting into my 70 Roadrunner . 510 torque . Which is the best motor mounts to use that I won't need to worry about breaking ? And where do I buy them ? I'm new to owning a Mopar . Any suggestions would be great . Thanks

[@jeffreybrianring6392]

Schumacher, they're located in Washington state.

[@boblongdickder6178]

Talk about having the best job in the world

[@FJ80Coop]

Welp 2nd best,the talent scout for a whorehouse might edge it out a little... 😁

[@robroyce6845]

RB v8~~righteous big block v8 engine..with a carter thermoquad no less

[@jediknight1294]

God I love a mopar and a street cruiser with a little punch engine.

[@TheRoguelement]

I'm still getting my head wrapped around how trendy The I'm So Stoked Dude is and if Steve allows him in the Dyno room with his flip flops on ?

[@ronwade2206]

The Mopar 383 was a Cop's favorite motor.

[@dahut3614]

8:55 383 Mopar hit a wall at 5400- drop-off was not smooth. Valve float, ignition, rev limiter, or intentionally handicapped, because it just couldn't win, could it?!

[@jarmominkkinen9409]

Hello gaise.Have 440 wedge Alu Heads ported from super stock gaie.TTI headers real good 3" The rest.Roller cam 0.585 lift.Weiand Tunnel Ram intake.Komp 10.3.1, Forged parts all..Have even Nos system fogger.Mayby abaut 150-175hk Wide The Nos.Can i get 700+hp? Street car lite racing tou...

[@anthonyking4387]

383 mopar compaired to a 440 is daylight to dark differance!

[@markbroad119]

Dang, stock that makes about what my '95 7.3 makes. Hahah I've straight piped it and TS 6 position tuner. +100hp tune. 😢

[@floridaroadracerguy]

Chevy has 10 less cubes, smaller valves, shorter intake runners. Not too shabby.

[@Impactjunky]

I guess that's why it took 200 more RPM and slightly more time to make the same amount of power.

[@frankgecko72]

I wonder if a tunnel ram intake with the 850 carb would make more horsepower? Please spoil me?

[@chandlerlofton6536]

What’s up with the Dulcich 318? You think he’ll come off the recipe?

[@twizteddreamz4095]

What oil pan should I look to get for the 440 going on a s10 frame?

[@dustintunis9347]

Just put it behind the cab.

[@twizteddreamz4095]

@@dustintunis9347 the frame is going under a 1961 4door FALCON

[@dustintunis9347]

@@twizteddreamz4095 - Oh, that makes a difference. Somehow I missed 'frame'... So you're building a Ford/GM/Mopar combo I take it?

[@twizteddreamz4095]

@@dustintunis9347 yes building my dad and brothers 1961 4door FALCON using my 2001 bagged gmc Sonoma frame. My step son got my a 440 motor and trans out of a 78 camper for free. Something different

[@NorthwoodsNomad]

I just acquired a Chrysler 383 bolted to an A727 transmission ( came out of a 1971 Challenger ) I’m going to put it in a 1971 Dodge D100 I’d like to have it built just like this engine here . Can you provide me with the details on the build ?

[@Coelacanth97]

My '70 Charger 500 has original numbers-matching 383 Magnum, already upgraded to electronic ignition, Edelbrock Performer intake and Eddy 750 cfm carb, bored 0.30, mild performance engine rebuild 3 decades ago and it's been sitting for 20-odd years, now in the shop for body & paint. I'd also be interested in knowing what the next, best bang-for-the-buck performance upgrades I should consider. Still running the stock HP exhaust manifolds. Should I go with headers? An expensive MSD distributor like in this video? I'd like to get up over 400 hp too. Thanks.

[@joshua9396]

Need that in my 69 3/4 ton dodge

[@kingjeremysircornwell7847]

Blaster coil, Flame thrower ignition, foam the air cleaner, 200 degree thermostat.

[@duanewhite3184]

Looking for old mopar parts hemi engines dual quad intakes and much more look up Mopar Perry he just might have what you're looking for

[@William-Bill-Munny]

I still regret selling my air grabber 1971 GTX 30 years ago........ $1,500 bucks 🤧

[@francfurian8215]

😣

[@captmack007]

I feel ya

[@earlputnal9124]

But when it comes to reputation. The Mopar motor wins alot more on the tracks as Chevy though. Especially with drag racing.

[@wymple09]

You've no clue about dirt track racing. I spent decades watching almost every car being a Chevy.

[@johnwilliamson467]

440 longer connecting rods ? .125 longer or maybe .145 longer based on cost.

[@moparone7962]

Did you put the pistons upsidedown, backwards and inside out to get an extra .0045 horsepower?

[@Impactjunky]

@mopar one It's funny because at least one old Mopar performance tech book told you to turn the pistons around backwards.

[@seggzslimjimz1179]

@@Impactjunky yup

[@tman3831]

Wait... since when did a tight lsa make more torque?

[@TwentytenS4B8]

Slap some Edelbrock heads on the 440. Even with that low compression, it would put it close to 500 HP. Also, with that CR, it's screaming for boost.

[@albertgaspar627]

when Mopar claimed its 440 Magnum made 375 hp, it did it with a 625 cfm Carter, and most folks think with that soda straw it was more like 325...interesting to see if there had been a better carb and cam, a low compression 1970's 440 could have exceeded that actual number. if only there hadn't been a gas crisis in 1973...

[@davef.2811]

And the insurance companies...

[@deanmink5148]

That's all a 440 needs based on 80% volumetric efficiency unless you're going to spin it over 6500 rpm

[@wheels-n-tires1846]

If only the big block had continued living like its competitors did... Imagine if we'd have multiport injected 440s, factory alum heads, etc in the wrecking yards...!!! *sigh...

[@in-rust-we-trust2831]

Woah it's almost like a big block will out perform a small block haha

[@danrowley7002]

I’m wondering why he didn’t mill the heads for a little more compression?

[@wheels-n-tires1846]

Haha... That's what I did when i couldnt afford new pistons...took .065 off the 452s and it woke right up LOL!!!🤣

[@kccodex8931]

They did...to make it fair they matched the Chevy.

[@johnandersonjjr]

Too bad the motor home didn’t have its stock heads for a base line.I thought original compression 8.2 ish 77/78 ish.I thought it was only the HP (police)that only had 7.6ish

[@robertbusin9983]

When r u going to do a pig pen video thanks

[@emilianocruz11]

Freiburger and Dulcich we need dyno test of the 426 hemi vs 454 big block chevy

[@moparty3875]

I think we already know who would win that battle

[@TwentytenS4B8]

There's a reason NASCAR banned 426 Hemis. Usually because they were walking right past 454's.

[@charlesprice7608]

Funny everyone wants to see 426 hemi’s no one runs them on the street, must me a reason for that! I had a Super Bee with a 383 back in the early 80’s. Went looking for a hemi, even mopar guys were telling me you would be better of with a 440, 383, you name it. They would say really you don’t want a hemi. Found out how expensive mopar parts were. Sold my Super Bee and got a 68 Camaro. Wanted a 10 second street car and knew I would never get there on my budget in a mopar.

[@jennifermarshall8218]

@@moparty3875 true story, i beat them regularly, have a nice day Slopar!

[@1967davethewave]

@@TwentytenS4B8 NASCAR never banned 426 Hemi's. They required any engine being run to actually be a production engine. Mopar stopped making the 426 at the end of the 71 model year so they started using the 440. Now any engine over 305 c.i. was banned for use in the aerocars like the Superbird, Daytona and Talledaga Fords. That is why they dropped them in 1971. But the Hemi was never specifically banned in NASCAR.

[@chrisbaughman9860]

The Mopar my lord she was singing

[@antilaw9911]

Now give the Mopar the timing it wants. Eat that chevy!

[@StephenGiovi]

Guys, when Dulcich made the cam install to 101 degrees to close the intake valve sooner, was he taking into consideration the fact that the cam that was chosen would not produce power unless the 440 you are running was at 9.5:1, the lowest the cam could run and still make power? Get that out...just wondering.

[@dahut3614]

That's only one degree advanced from spec. The specs on that cam are very similar to the Hughes Whiplash cams that are designed especially for low compression engines. In fact, they don't recommend over 8.9:1 on pump gas! There must be something with that tight lobe separation angle and long duration, but the science completely eludes me.

[@johnrivinius4873]

Need a Thermoquad t shirt

[@danpatterson8009]

Taller deck height makes more torque due to geometry.

[@1967davethewave]

Actually, if you watch the entire episode they surmise that the longer intake runners on the much wider block are responsible for the increased torque.

[@joelsundgren4982]

Please please bring back motortrend to Europe 😢

[@welderteach]

I’d love to see some budget mods for fords especially the coyote

[@josephpezzuco9012]

I Have a 440-1 wat is that

[@josiptomas6130]

This motorhome 440 needs a turbocharger.

[@reed32]

For reals

[@dylansears7192]

As I would agree. But on my 72 there aint really room for 1 but a supercharger fits.

[@FJ80Coop]

It really needs a massive supercharger and tuneable efi with that compression ratio,those heads and cam..

[@forestlawrencegrading9154]

I had a b Mopar and a small block Chevy apart at the same time I swear them Mopar heads sure look a lot like the small block Chevy

[@thespicemelange.1]

Or is it the other way around? 🤔

[@forestlawrencegrading9154]

@@thespicemelange.1 they sort of look similar and some of their Construction it's one way or the other lol other than rocker bar and rocker arm water in the intake the ports look the same they have the same spark plug

[@DylanL69]

Chevy copied mopar

[@georgewetzel4380]

@@DylanL69 it's the opposite; that's common knowledge. Small block Chevy introduced 1955, Chrysler B 1958.

[@DylanL69]

@@georgewetzel4380 I'm pretty sure they didn't use 906 heads in the 50's

[@m.pietro9087]

I’m surprised the Mopar outpower the Chevy and the reason I’m surprised is because the Chevy engine has a lighter rotating assembly.

[@longshot82383]

Now do the same to a late model 460

[@DylanL69]

Now you need to try efi and see what the numbers would be I bet with port injection both numbers would be higher

[@DylanL69]

@Car Guy daddyo not efi is for muscle cars. Muscle cars about making the car faster just like a hotrod and that's what efi does you were probably using throttle body injection and not port injection or you probably had the wrong fuel pump or injectors not letting it make more power