6-71 vs THE WORLD-SBC, BBC & LS!

[@andrewmiosge5027]

I would love to see the difference between a 671, 871, 1471 all on the same engine running the same boost to see which one is more efficient, thought it would be a cool test 👍

[@MrAPCProductions]

Let's make this a 14-71 vs the world. Come Richard we believe in you!

[@dj280zx]

went down to the comments to say the same exact thing

[@ironguts1097]

Yes!!!

[@darwinfridgeseals741]

Thanks sooooooo much Richard, you are the best. Love from Australia

[@miked7142]

It would be nice to see some build combos for old school 396 bbc

[@dstrong11]

400 ci. Small Block with this 6-71 blower. You got displacement in a small package, but will have a ton of power and torque. Best of both worlds. Sitting in either a 55 Chevy or 57 Step-side 😎

[@lucasmullins5100]

Reason to own a 6-71 it's just so damn pretty! Might have to put one on the 51 Bel Air

[@deanstevenson6527]

Lucas Mullins : I like them because you can tell your Ford and Mopar friends your GM car comes equiped with a dual quad "7 litre" or "426". ( Plus whatever good GM engine you got underneath...) Six times 71 is exactly that. They make bulk boost if done right. Dont forget your Rootes my friend....

[@deanstevenson6527]

Ive got another kind of super charger...an industrial blower from the Greggs Coffee Company where it was used to blow beans up to the second floor...My 6/71 would go on the left hand side of a Ak Miller style 250 Ford log head six in line with three Holley Sniper BBDs gettingfeed 426 cubes per rev on a 1:1 ratio. The way GMC put the blower on the 671 2 stroke is perfect for s non cross flow six. Plenty if room, and the stock alloy inlet can get polishrd and two big oval section 3 by 4 " dianeter silicone jointed tubes can feed a three carb hat to an almost port EFi intake on the cast iron log. Henry would not be pleased but Alfred P Sloan would smile alot uf he wad still alive.

[@lazyhoundracing9621]

@@deanstevenson6527 Nothing sexier than a Bel Air with a blower sticking out of the hood.

[@deanstevenson6527]

Michael Israel .MI word! I just got married in 1990.South Island New Zealand. Out side the house one Saturday Morning, there was John Abbots Yellow 1955 Chevy Bel Air. BBC 454 with GMC 6-71 blower in the Woolworths/ Countdown Mailer Street Dunedin Car Park. Ive been sober and a Chevy Loving Ford guy for 30 years. Ill never forget the sound of my first Rootes 71 series blower. This blower one the War in the Pacific in the Jimmy 3/71 diesel boats, but it one the war in my heart in 1990. Never a truer word spoken MI.

[@ZacLowing]

Back in the late 70's you'd see guys with blown 350's saying they make 700hp... and now we know.

[@jeremypike9153]

I want to see a 671 on a rotary that sounds interesting

[@Terryray123]

On holley intake 13b

[@austindoud273]

I honestly don't know if a 13b could turn it

[@eliasmelendez1271]

@@austindoud273 depending on what pulley you use because a rotary engine will outperform the supercharger. I've seen peripheral port 13b engines revving to 13,500rpm on a 1250cfm dominator. They will turn that supercharger easily but it does depend on the configuration of the pulley to turn it.

[@rob-vz4wt]

3 rotor compound boost.

[@eliasmelendez1271]

@@rob-vz4wt so you want to see a 20b running on a 6-71 or 8-71? Heck why not do a 4 rotor 26b from Rob Dahm lol

[@adamspencer8199]

I can appreciate that most folks want to see the big numbers The power under the curve is the big block magic Nobody ever talks about torque production Or the fact that hp is a mathematical equation. I love tour vids Keep it up brother

[@lazyhoundracing9621]

I'm running a 6-71 on my inline 292 going in my 53 Chevy 1/2 ton pickup. 6 stage dry sump, Electromotive direct fire ignition. duel 650 dp carbs. 12 port Falconer cross flow head. TKO 600 trans Frankland quick change rear end with Gleason torson dif.

[@Blood04]

Uhh... I'm a little disappointed to not see a couple videos on your YT about this.. lol.. that sounds insanely bad ass, and im sure i'm not alone in saying - make some content!

[@kevinwest3689]

You should tape that message about your build/combination to your refrigerator or coffeemaker. Talk about setting the mood for the day! Your wife could wake up on the wrong side of the bed, you notice that your losing your hair, the dog could have got in the trash, and some kid put a M80 in your mailbox, and after reading your note you think, Man... today is going to be a good day 🤘

[@lazyhoundracing9621]

@@kevinwest3689 No wife no kids that's how I get away with it. Just me and my 2 Basset Hounds.

[@richardholdener1727]

that sounds awesome

[@lazyhoundracing9621]

@@richardholdener1727 Thanks for the advice to move from my 4-71 to a 6-71. Now I need a home for the 4-71.

[@kennethraff2002]

Building a 1978 280z with a 496 N/A big block all of your videos has really helped me out on making choices for the build and I would also choose the 496 with this blower

[@Markspyro]

thanks for this. I was wondering what to expect when adding a blower.

[@rockyjones9956]

Awesome! Love the LS test. Mix of old school and new school.

[@codywoolf7476]

Would love to see you do this with a 283 SBC

[@ArmandoMartinez-zz5xt]

BBF baby 460, I'd love to either duplicate a "Bigfoot" build or put it in a early 50s ford pickup!

[@MisterMayhem727]

Have a 77 F250 highboy 4X4. I am just going to throw a 6.0 LS and a 4L80 in it if I ever end up doing anything with it just to piss people off for my amusement.

[@Hippoyeetomus]

So you’re saying I should put a 6-71 on my already cammed chevy avalanche? 😏🤔

[@pewpew-_-2157]

yes

[@bill2178]

no

[@AB-80X]

Why would you put a 6-71 on anything when you can get an 8-71 for about the same money?

[@zAvAvAz]

put an 8-71.

[@Cletrac305]

Great video! Thanks for the hard work! My 6-71 engine? Easy! My 1957 392 hemi! A little nitro and a slingshot dragster! I'm building a bug catcher injected, race stripped TBS 10-71 on a 572 Keith Black hemi. 8:0 CR, 1200hp on pump gas (These engines will make around 1000hp N/A with 12.5:1) it will have 2 stage water methanol injection at around 12psi boost. 280*, 290* at .050 duration on a 112 ctr .645 lift mech roller cam. NO builder of these engines recommend more than 8.5:1 even when I begged for 9.0! This was for durability, they said more boost was better than more CR. I'm building it, when the 18+mo wait for ceramic coated pistons ends! Blowers make this power level much more streetable than N/A. take care of it and your grandkids can use that hard anodized blower on ANYTHING!

[@richardholdener1727]

good luck

[@billwesely7626]

Maybe do a video comparing the "stroked" BBC 496 vs the "bored" BBC 502

[@renwickconolly2839]

Great suggestion I think!

[@Silkmaster4200]

also 572. 632 is it a Ford engine or GM ? I forgot lol

[@tangotango256]

@@Silkmaster4200 632 Gm ;- )

[@bobsbasementhotrains3020]

Just a idea for a future test . Chev 366 or 427 tall deck truck block. What power numbers with stock engine with after market , cam, intake, headers, ECT.

[@jameswhiteman6901]

Not one dyno video here .....dude just loves the sound of his own voice.🤯🤯🤯

[@RandomLifeTimothy]

No dislikes. You broke the internet

[@jeffjohnon4223]

The small block crate motor would have been cool to change just the cam and then run the blower,no other mods.3rd gen Firebird/Camaro.

[@marcstlaurent3719]

Excellent work as always Richard , thanks again . I would start with good cnc heads on any serious combination, the Blueprint 540 is a good example of Chinese heads on a big motor and the 496 has offshore castings as well but at least they were CNC ported

[@calebdean2440]

Even though its a discussion thats over 50 years old now, I bet between the vast dyno records you have and the way you explain things, it would be interesting to see the differencess in the power/torque curves of a sbc, bbc, and LS that all have close to the same peak horsepower numbers.

[@Darkhalfcustoms]

Glad to see the Gen 6 back in the testing.

[@tomcampbell4414]

Awesome video!

[@69JANKS]

Cool vid , great tests. Blowers Rule 😎🏁

[@SkinnyPedalKicker]

Id put it on what I have which is a 330hp 350ci Chevy crate in my 71 vette. I want to go big block on the car someday but this would definitely hold me over until then. haha

[@acetylene1969]

Buddy has a 6-71 on a 468 in a 66 Chevy2. He built it about 20 years ago and it's still running great. It's a driver, not a trailer queen.

[@shatteredskull1]

Hi Richard. Awesome channel!! Have you ever come across a 308 Holden ? Really popular here in NZ and Australia where they were built. Keep up the great work!!

[@Hemi-gc8zg]

426 hemi in 1970 challenger,,but would like to see on new jen hemis to.loved the piece on the turbo 5.7 ya did ,have the perfect little dakota in mind.

[@KirbyPuckett91]

On my 388 stroker sitting inside my very rusty '72 Nova that's been sitting dormant since I got out of the Navy went to college and had kids.

[@brandonhayduke6385]

Why does the older videos of this and the dyno graphs show 8-71 and not 6-71. Which blower was used?

[@brianbloom1799]

The 6-71’s boost curve began to curve at around 4 after running 11 percent under at its latest analysis.When it reaches 3,300 rpm, it reaches 8 psi at 2,700 rpm.At 6,400rpm the engine has a max performance of 3 psi.It can be rated with systolic power of 602 horsepower (hp) at a max speed of 6,400rpm and output of 551 pounds per square foot (lbs) at a maximum speed of 4,900rpm.

[@Sir.VicsMasher]

❤️Westech's Gladiator 350❤️ 527hp from a 350hp ZZ4 with a off the shelf head and cam swap blew my mind 20 years ago.

[@Darkhalfcustoms]

@RichardHoldener why does the file name on the 540 say 871 blower not 671?

[@richardholdener1727]

it did-I labeled it wrong

[@killyonbibbs5601]

Thanks for your hard work.

[@robertkeime4907]

Great video

[@chrislangdell117]

Love to see it on a 500 cubic inch Mopar. Thats the motor I need to build for my next project. Would love to see some power combinations and camshaft set ups for a nasty street strip combo. Also running it on a 500 cubic inch ford would be great to see.

[@michaelcastro9934]

I have a 6-71 blower that I'm going to install on my 454 with Bill Jenkins merlin heads. Want to see how mush horse power it will produce. Going in a 67 Firebird.

[@rickybobby0314]

Very cool test 👍👍

[@dennisgray7509]

I want that 6-71 on my 383 original small block Chevy and in my 86 Iroc Z! Think that would be a good combo.

[@RumblestripDotNet]

What's cooler than a 6-71 sticking through the hood as you drive around on the street? A 14-71 Injected Screw Blower!

[@justinmitchell3807]

I’d love to find one to put in my dads 83 ss Monte Carlo that I now own . Rip pops

[@thesquirrelchroniclesakare7808]

That 6.71 on the LS would be a helluva combo in my 87 Z28 Camaro !

[@johnparrish9215]

A 462 MEL engine and install it into a 1960 Ford Falcon.

[@douggorton1482]

Things I would like to know and have never seen any test on. With a turbo or a centrifugal super charger: what is the effect of different size/kind of air cleaner and what happens when you use different kinds of air inlet pipes (straight, 90 degrees and 180 degrees. )

[@stevestauff2220]

Love it. I would be going 496 and put it in my 93 s10

[@JohnClutch1]

I would install the blower on a 9.7:1 destroked LS with a 5spd, stuffed into a Opel GT :)

[@calvinevans8305]

Now that's what I want to see.

[@doonhkahn]

I'd put it on a 383 small block, Holley Terminator X w/dual throttle bodies on top, backed with a TH400 w/Gear Vendors od/splitter tailshaft and stick it into my 65 c10 shortbed fleetside.

[@Knightmare-gz9ls]

That 496 with a 6 or 871 would be epic in my 86 Monte SS. 🤘🏻 maybe a stout 383 small block and a 871.

[@KingJT80]

8-71 is 4 digit territory

[@alexthompson5172]

can you do some more tests with that 540?

[@richardholdener1727]

there are lots of vids up on the 540

[@pmd7771969]

Rich how about breaching the 2000 hp mark. I have some suggestions on doing that. Bloodviking

[@83jward]

Loving the big blocks lately but if have to go with the blown 383 ls and make it fit in my 05 suburban!

[@r.h.5052]

That supercharger on the small block is a lot of $$$ just for an oooh ahhh factor

[@bcbloc02]

It would have been cool to do this test with the same blower ratios to show how cramming the same amount of air into a small engine can make the same power as a big engine minus the efficiency difference. Of course I think this would mean you would have like 30 psi on the 350 and 2 on the 540.

[@Cletrac305]

I've been busy building up a 572 10-71 blown hemi. If you think about it the engine is an attachment to the blower! The stripped blower as a positive displacement pump that directly regulates how much A/F is burned (power) The engine just converts that energy into rotation, more or less efficiently, larger more efficient motor, more hp at lower rpm (HP is just torque x speed, that's why ALL engines make the same torque as HP at 5250 rpm) this is because of much less pumping losses. But still surprisingly close if similar breathing abilities in port cfm vs ci. It always amused me that the turbo guys push "efficiency" while roots types seem to make more power with much less boost! Yes, it's easier to get more from a turbo but at a loss of throttle response. I've yet to see a 71 series roots supercharger failure take the engine with it, saw several turbos do it tho! Saw several engine failures take turbos but only very rarely in non nitro applications (someone didn't read the manual!) take a roots out. I consider the blower a lifelong investment I can rebuild myself because I WILL be running an air cleaner! Get tired of the hemi, put it on a loose motor home 440 and go tens!

[@TheFlash-cat]

Would love to see IAT before and after blower. Bet an after cooler would really add some power

[@richardholdener1727]

its pretty cool with the carbs and low boost-even better with e85

[@rodcooke7678]

Easy to decide what to build for this one. I have a really similarly spec'd 496 already bulit, now which to drop it in, my 67 Caprice that has a L88 spec'd 427 with a tunnel ram & TKO 5 spd or my '91 R2500 Suburban that the 496 was originally slated for?

[@johngoodman1177]

I am considering a 671for my stroked 409(482) W head engine. It has a stock GM forged 454 crank, Scat rods, Edelbrock aluminum heads, Super Lobes (Dema Elgin) flat tappet cam and Ross pistons. It currently is using two Edelbrock 4V carbs with a 9.5:1 cr. It sits in my 1962 Bel Air 2-door post car with 4-speed M20 gearbox. A Ford 9” rear end and limited slip diff. I think this car would greatly benefit from a 671.

[@tonybiagetti3953]

Hi there I would use the 496 and I would have it in my 1970 pro Street Nova

[@besearchingforwisdom6267]

Just when I was getting some sleep... If you keep this up, I'll be single again

[@tomcrosby6332]

My daughter's '69 Plymouth GTX with motor home 440. purple camshaft (.484) , '66 ported heads.

[@whf3826]

Would love to see this on a bone stock 5.3.

[@scotthumpries-norton3942]

Hi Richard I’d love to see a 6.0 Ls stroked to a 418 or so with your preferred choice of parts tested in the same way including the 6/71 and 8/71 and also carby verse injected….for your followers here is Australia 🇦🇺 cheers cob

[@MrBlackbutang]

Have you ever Dyno 460 blue thunder heads?

[@ardenplocher3785]

I have a 6-71 v mount on my home made roadster with a 350 sbc back yard motor.

[@matthewdaniels7462]

Great vid but we have not herd anything run in a few vids.

[@eliasmelendez1271]

I would love to see that 496 with the 6-71 or a 8-71 running 11psi pulley on e85. That is what my father in law wants to do to his chevy 2 nova lol and yes its a M22 rock crusher transmission. With a 3.73 rear. I think his blower is a 8-71 on it because he told me it made 1200whp back in the early 90s with it. He told me it scared the crap out of him because he's a ol'skool street racer and retired the car lol

[@alexthompson5172]

can u do a test where you compare different power adders of equal hp rating and run them at the same boost level?

[@richardholdener1727]

watch the mod ford video where i ran all four forms of forced induction at the same boost level

[@TheNumbers400]

Big cam high cid LS in an off-road truck. I would love to see more roots LS action. LSA perhaps?

[@Lagrange1186]

I wanna see it on the 292 rich! Make it happen!!!! 😂

[@c0c0asauce]

I want to put a 671 on my 454 but, unless I'm missing something (nostalgia?), I could get a functional turbo setup for the price of a bare blower housing.

[@Dr_Xyzt]

Just get the damn blower. You can't have something for nothing, and you can't get what you pay for. I could have turbo'd my 4.3 vortec instead of get an LS. When I hit the start button, I never think "Aw man, I could have had a turbo 4.3 for sooo much less money." The minute you fire up a cammed supercharged big block, you'll forget about what it cost. You'll feel invincible.

[@c0c0asauce]

@@Dr_Xyzt I'm Swapping a gen 6 454 into a 95 Stepside with a 5 speed manual. It's waiting on a cam and other stuff before it goes in so it's already a big step up from the tired sbc that it came with. I got way to many projects and once I get one or two sold I'll probably splurge on something like that.

[@dredenap1995]

What about the lt platform i have an lt2 from a c8 and a 671 on it would be insane

[@richardhenson4257]

What was the timing on the relatively stock engine at?

[@zanehope8766]

Id put that 671 on my stroked sbc in my 23 T-bucket altered. That would be a fun ride

[@bigredracer7848]

138👍's up guys thanks again for taking the time for us all to see you in action

[@greasemonkey258]

A 6-71 on a 351W would bridge the gap between the SBC and LS engines, I'm a GM guy by preference but I'm not biased. I like a lot of different engines, a stout 408W is one of my favorites and can be had on a budget.

[@wstxiseeyou]

So how is that 4.7 HO coming?

[@woodgrain18]

Forged ls2 or ls3 with a tall bottom intake from Australia a carbon fiber 4 blade big and ugly hat on alchohol in 70 through 78 Nova small tire leafspring car! Yes and thank you

[@PatrickjazzguitarBro]

I would like to see the same blower on a 396 or 402 BBC, just to see what can be done with the under-appreciated engine.

[@michaellenca9457]

How about testing a 871 or a 1071 supercharger on BBC? Not ever one that watches your channel are car guys. Interested in offshore marine setups. Currently building 557 ci Dart BBC configuration. I am steered towards a 1071 supercharger, your thoughts?

[@richardholdener1727]

lots of blown BBC vids on the channel

[@Dr_Xyzt]

The LS would be nice in a factory 5 '33 Ford truck. Snap-on and Joey Logano did a good feature with that car. Another option would be to use the 496 in a '72 Nova.

[@wadewright3556]

lol. The 496 would be much better.

[@russelljackson7034]

Right on

[@codyheizler7294]

I wonder what the HP difference would’ve been if that 350 had vortex heads.

[@coreybell9525]

my dad just built a sbc 383 low compression and dynod it on 110 and made just over 630 at 11psi before being fine tuned. they dyno didnt wanna run it to 6500 but it was climbing at 6200 pretty good still. its in a 70 camaro now one of the pulls i taped but not the final pull its on my page

[@rudyramos2562]

I would run the 496 with an 8-71 in a Nova, but I would be worried about how much PSI that motor can handle, and I am curious about what PSI this supercharger maxes out at.

[@richardholdener1727]

A VERY GOOD 6-71 WILL SUPPORT NEAR 1000 HP-MOST RUN MUCH LESS

[@rudyramos2562]

@@richardholdener1727 Thank you.

[@jordan-ramblinaround2323]

How do you feel about Teflon strips on the street? Is it okay? How long will they hold up? I've heard street miles really hurts them, but nearly everything blower shop sells has them.

[@richardholdener1727]

they are not good for long term

[@user-bo9wp6en3c]

hello i have a 74 corvette with 300hp i want a blower can you tell me everything i need just to get that look and sound i dont care of massive power just all i need kit wise please thank you

[@bigblockmaro1]

We run a 6-71 on our 481x Nostalgia A/Fuel car. Makes north of 1800hp has gone 6.3x at 220mph. Lots of things you can do to them!

[@richardholdener1727]

a 6-71 making 1800?

[@bigblockmaro1]

Richard Holdener yes sir, I believe class record is 6.05@ 226 with a 6-71 at 1800lbs with a 2 speed trans. TBS XR1 are one of the good ones that can make that kind of power

[@allenjames7359]

Hey Richard..I have a 496 going in a 1977 camaro with a power glide.. what size carbs do I need to run on it? I also have a weiand tunnel ram which carbs for it on the same combo? Thanks...I love your videos

[@richardholdener1727]

750s work well depending on power level

[@allenjames7359]

@@richardholdener1727 thanks...I had a few guys tell me that 600's was the best but from watching you and the Steve's from engine masters I was thinking 750's was what I wanted but I wanted to find out directly from you

[@zAvAvAz]

A low rpm build for daily driver cruiser 2nd gen camaro. 8-71 or eddy enforcer on a dart block, 4.155" bore ,9.025", 5.85" H beam rod, 3.25" forged crank. 1.55" blower cup dish Mahle piston, TFS super 23 175cc heads with 72cc chambers or different sizings, blower seal head gaskets, XR252HR style cam or other tiny retro roller like the XR264HR although target idle is a low 450 rpm. mated to a custom 7 speed close ratio automatic and tight blower onverter, with lower than stock stall, custom siphon fuel system, with more throttle more jets that develop same atomization consistently, Maybe use a smaller blower? Want overdriven low rpm engine at medium high boost blower with adjustable bleed off valve boost conroller. Daily driver with slalom equal track width tires 15x12 with p295 BFG's and full flare arches. Roll bar, X braces, front and rear bucket seats jegs or summit. Car candy pearl metallic medium charcoal grey with giant dry apply silver, black, grey metal flake. inside and out every part and interior panels and sheet metal bottom of car etc. Entire engine and every part bolted to engine is Ceramic chrome, aluminum, or ceramic grey and also exhaust to double barrel dual tips. 60 gallon gas tank. truck arm rear suspension and watts link, strut front coil over with rack and pinion. Dual master cylinders manual with mechanical assisted brake assembly and foot box. Engine set back. equal length headers, flowmaster 50 series quiet mufflers 3" exhaust. rear diffuser front air dam, transam fiberglass rear bumper cover, custom tailight panel, all led lighting, night vision and infra red internal window screens, Entire car sprayed max clr epoxy clear UV protect with 10% silica mix also the wheels inside and out, the driveshaft body color , the rear end as well as everything body color even the wheels.. Aluminum wheels everything finely balanced.

[@timothykrivinko4060]

I really enjoy your vids. I have a 565ci big chevy being built for my 73 chevy k20 4x4 , engine will have AFR 335 heads , bds 10-71 , bullet racing hyd roller cam 4-7 swap .680 lift 255/265 @.050 112 lsa , boost target is 8lbs for premium pump fuel. Static cr is 8.5:1....what are your thoughts on this..?

[@danielsullivan9865]

Would look good on a V-drive drag boat

[@richardv.K]

Put a 6-71 in a Coyote!!! i want to see that.

[@CarlosGomez-um6im]

Pls do 8100 vortec

[@trullmann]

This would be fun in my 6.2l Gen1 Raptor!

[@mathewkulczyk1645]

Great video!! I would LOVE to put a 6-71 on my 454( in a 1990 one ton dually, 60,000 miles) but where does the torque curve start in the RPM's and I think torque would come in too high on the tac to be any use for hauling a camper/travel trailer and a wrangler in tow!! Am i wrong about this? Would the gas milage be affected for the better or worse?? Thanks for your video.

[@richardholdener1727]

torque is immediate-definitely mileage change

[@mathewkulczyk1645]

@@richardholdener1727 Thank you for your fast response. I don't get a lot of milage in this truck anyway so the best route is to improve air flow and make a little more milage and maybe torque and leave it alone since it's a good strong motor for towing as it is. Just love the looks of that supercharger sticking out of the hood! If it Ain't broke don't mess with it...Right! 😆

[@gearhead2270]

@@richardholdener1727 awesome and informative video I have been digging around for a kit for a gen 6 454. Have you heard of a 671 full kit?

[@thebigpicture2032]

I’d go for the crate motor 6-71 and put it in a 61 Corvette. Do a Day 3 car and drive it around like it’s the 70’s again.

[@TopAnimeGuy]

Honestly I think I would run the most mild combo. Would be easy to get parts if something breaks and I wouldn't feel bad if I trash the engine because its just a smogger 350. Also with the tame characteristics it would be sooo street-able. You might even take it on the highway if you had some overdrive too.

[@wadewright3556]

I'd like to know what the compression ratio was for the 496.

[@richardholdener1727]

10.2

[@wadewright3556]

@@richardholdener1727 thanks for getting back to me on that.