6-71 vs THE WORLD-SBC, BBC & LS!
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- เผยแพร่เมื่อ 3 ก.ย. 2020
- FULL RESULTS, 6-71 BLOWER ON 6 DIFFERENT ENGINE COMBOS!!!!!! HOW MUCH POWER DOES A 6-71 SUPERCHARGER ADD? WELL, THE POWER GAINS ARE DIFFERENT WHEN YOU ADD THE ROOTS BLOWER TO A 190-HP CRATE SMALL BLOCK COMPARED TO A 540-INCH BBC STROKER. CHECK OUT THE GAINS ON EACH COMBO AS WELL ADD THE 6-71 SUPERCHARGER TO A PAIR OF SMALL BLOCKS (MILD & WILD), A HEALTHY LS STROKER AND A TRIO OF BIG BLOCK CHEVYS (454, 496 AND 540).
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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 👍
Let's make this a 14-71 vs the world. Come Richard we believe in you!
went down to the comments to say the same exact thing
Yes!!!
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 😎
Thanks sooooooo much Richard, you are the best. Love from Australia
Reason to own a 6-71 it's just so damn pretty! Might have to put one on the 51 Bel Air
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....
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.
@@deanstevenson6527 Nothing sexier than a Bel Air with a blower sticking out of the hood.
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.
Back in the late 70's you'd see guys with blown 350's saying they make 700hp... and now we know.
thanks for this. I was wondering what to expect when adding a blower.
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
So you’re saying I should put a 6-71 on my already cammed chevy avalanche? 😏🤔
yes
no
Why would you put a 6-71 on anything when you can get an 8-71 for about the same money?
put an 8-71.
Awesome! Love the LS test. Mix of old school and new school.
I want to see a 671 on a rotary that sounds interesting
On holley intake 13b
I honestly don't know if a 13b could turn it
@@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.
3 rotor compound boost.
@@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
A 462 MEL engine and install it into a 1960 Ford Falcon.
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.
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.
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.
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!
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 🤘
@@kevinwest3689 No wife no kids that's how I get away with it. Just me and my 2 Basset Hounds.
that sounds awesome
@@richardholdener1727 Thanks for the advice to move from my 4-71 to a 6-71. Now I need a home for the 4-71.
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
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
BBF baby 460, I'd love to either duplicate a "Bigfoot" build or put it in a early 50s ford pickup!
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.
Cool vid , great tests. Blowers Rule 😎🏁
Thanks for your hard work.
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.
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
Glad to see the Gen 6 back in the testing.
Awesome video!
What's cooler than a 6-71 sticking through the hood as you drive around on the street? A 14-71 Injected Screw Blower!
Very cool test 👍👍
That 6.71 on the LS would be a helluva combo in my 87 Z28 Camaro !
Great video
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!!
Would love to see you do this with a 283 SBC
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.
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.
Love it. I would be going 496 and put it in my 93 s10
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.
Maybe do a video comparing the "stroked" BBC 496 vs the "bored" BBC 502
Great suggestion I think!
also 572. 632 is it a Ford engine or GM ? I forgot lol
@@Silkmaster4200 632 Gm ;- )
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.
❤️Westech's Gladiator 350❤️ 527hp from a 350hp ZZ4 with a off the shelf head and cam swap blew my mind 20 years ago.
I’d love to find one to put in my dads 83 ss Monte Carlo that I now own . Rip pops
Not one dyno video here .....dude just loves the sound of his own voice.🤯🤯🤯
Id put that 671 on my stroked sbc in my 23 T-bucket altered. That would be a fun ride
My daughter's '69 Plymouth GTX with motor home 440. purple camshaft (.484) , '66 ported heads.
No dislikes. You broke the internet
It would be nice to see some build combos for old school 396 bbc
Thanks for you content and informative videos. I would like to know one additional point of information on your tests... how much? What is a cost to these monsters- cause I think some of the heads alone you run cost more than my entire setup. So I’m curious to know how much it will cost me to get better. Thanks
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!
good luck
Just when I was getting some sleep...
If you keep this up, I'll be single again
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. )
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.
That supercharger on the small block is a lot of $$$ just for an oooh ahhh factor
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.
I wanna see it on the 292 rich! Make it happen!!!! 😂
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.
138👍's up guys thanks again for taking the time for us all to see you in action
Loving the big blocks lately but if have to go with the blown 383 ls and make it fit in my 05 suburban!
This would be fun in my 6.2l Gen1 Raptor!
I'd slap that aluminum goodness on a Poncho 455 and stuff it in a '71-'76 Trans Am.
That 496 with a 6 or 871 would be epic in my 86 Monte SS. 🤘🏻 maybe a stout 383 small block and a 871.
8-71 is 4 digit territory
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?
Big cam high cid LS in an off-road truck. I would love to see more roots LS action. LSA perhaps?
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.
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.
I have a 6-71 v mount on my home made roadster with a 350 sbc back yard motor.
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..?
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
Hi Richard, excellent test 👌
Just inquiring to see, have you used the speedmaster 6/71 blower shop copy? And if so have they held together?
As i am struggling to find real word feed back.
Thankyou for your time, keep up the testing 🙏
NEVER RUN THEIR BLOWER-ONLY THE KIT WITH A BLOWER SHOP BLOWER
@@richardholdener1727 thankyou appreciate the feedback
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
Put a 6-71 in a Coyote!!! i want to see that.
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.
Richard, Sorry for the mistake before, This test was done by Mcnally institue on a stock 454, My paper that i read from was 10 years old and i,m 65 and blind in one eye, And have built motors since 14 years old, And i do own a 67 chevelle 300 deluxe, 25,000 in the motor, just sitting, almost pass away 2 years ago, You might be to able to see it online from the 80's, sorry about being off 2 pounds psi, I just want people that don't have 10,000 that they can build a stock motor with 3500,with just a blower for hp, My car was called the twisting bitch
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.
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
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.
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
I would probably like to have that 496 in my s10 That would be nice that’s what I would use it for it would be a lot of fun
Id like to know if it would be worth putting a 6-71 on my basicly stock 308 single holly 650 square bore its in a 1976 holden utility bit like the American chevy el Comino. Its cammed and 60 thou over. Thoughts.?
I would most definitely use that blower on a 454 and put it in my 48 Anglia.
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.
LOVE IT!!!!!!!!!!!!
Would look good on a V-drive drag boat
Why does the older videos of this and the dyno graphs show 8-71 and not 6-71. Which blower was used?
Only engine that comes to mind for a roots blower is a hemi. What I'd love to see is a gen 3 6.4 hemi with a 10/71 roots blower and put it into a 4x4 first gen ram d100
Flat head ford. That would be nostalgic.
Right on
@RichardHoldener why does the file name on the 540 say 871 blower not 671?
it did-I labeled it wrong
Rich how about breaching the 2000 hp mark. I have some suggestions on doing that.
Bloodviking
I like the street sleeper attitude, so it would have to be on something that could be fit under the hood. How about on a Chrysler slant-6? Or a GMC 302. Or just plain weird; how about on a Mazda rotary? Or a little offbeat; on a Pontiac Grand Prix GTP with the transversely mounted 5.3. People would stare seeing the blower sticking through the hood sideways.
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.
lol. The 496 would be much better.
Love it on a 2v 4.6 Ford.
Small block mopar in my 1974 duster
I think that 496 with that blower belongs in my '95 trans am! 😁
missing just the Blower in my 78 firebird :)
Put the blower on a 460 in a fox body. Then again the 460 build you did before made more power than this blower round and without the blower. I guess having the bucks for a well built normally aspirated engine would be good. Stroker kit with aluminum heads and a roller cam would make anything move along.
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.
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
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.
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!
What were compression ratios on the big blocks? Where were the icl on the cams at, and what cfm were the carbs on the big blocks? This info would be greatly appreciated!
950, don't know icl, near 10:1
Richard, can you tell me the cam specs on the 372 sbc you used? Pretty impressive power for low boost. I run 12.5 psi on my roots SBC and am NOT happy with the power it makes.
What are your cam specs and your power output?
Great vid but we have not herd anything run in a few vids.
Hi there I would use the 496 and I would have it in my 1970 pro Street Nova
Would love to see IAT before and after blower. Bet an after cooler would really add some power
its pretty cool with the carbs and low boost-even better with e85
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.
they are not good for long term