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 Post subject: 6-71
 Post Posted: Fri Apr 16, 2010 8:13 am 
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Weekend Racer

Joined: Sat Nov 08, 2008 3:10 pm
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Location: Seaford, NY
So i might be able to get my hands on a dyers (i think) 6-71 for a good price, now the question i have is i have the gmpp 350/290 crate engine.. will the engine hold up?...

Im currently looking for a better motor, but i want something to play with now then do the swap of the engine over the winter


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 Post subject: Re: 6-71
 Post Posted: Fri Apr 16, 2010 1:59 pm 
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Location: Seaford, NY
So i just bought this motor.. will a 6-71 be happy with that set-up?




I have a brand new Chevy 383 Stroker Motor with ZERO miles. I just bought a big block and I have no use for it. I bought the motor brand new 3 years ago for about $4200 from an engine builder in Arkansas. Here's what it's got. 4 Bolt Main 11:1 Compression Speed Pro Forged Pistons Forged Rods with ARP Bolts Eagle Steel Crank ZZ Gapdura Moly File Fit RIngs Clevite 77 Tri-Metal Rod and Main bearings Comp Cams Solid Lifter Cam 555/555 Lift....248/248 Duration at .050 with a 106 centerline Cloyes True Roller Timing Chain Comp Cams Cam Locks Comp Cams XE Chrome Moly Pushrods Dyna Gear oil pump and pick up Moroso 7qt oil pan ARP Rocker Studs Dart Pro 1 Aluminum Heads with 2.05/1.60 Valves Scorpion 1.5 Roller Rockers Polished Victor Jr. Intake SFI Flywheel Balancer The motor was dynoed by the builder and produced 492 horsepower @ 6200rpm and 552 ft/lbs torque @ 5100rpm. I lost the dyno sheets though. The motor was run in car but never driven. The cam sounds great...real lopey idle. I'm not full of crap or trying to sell junk. This motor has zero miles and is a bargain. It's intake to pan...put in a distributor and carb and go have fun. Any questions please feel free to email me. Price is neg but no low ballers please.


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 Post subject: Re: 6-71
 Post Posted: Fri Apr 16, 2010 2:21 pm 
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The setup sounds good except for the cam and comperssion, for the big blowers you can get away with with a lobe seperation of 110 but 112-114 are better and get the compression down to about 8.5-1 and that should be good.

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 Post subject: Re: 6-71
 Post Posted: Sat Apr 17, 2010 1:48 pm 
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Location: Grove Oak, AL
bowtie81 wrote:
The setup sounds good except for the cam and comperssion, for the big blowers you can get away with with a lobe seperation of 110 but 112-114 are better and get the compression down to about 8.5-1 and that should be good.
X2 It would be a slug with that cam, all the boost would go out the exhaust...ask me how I know.

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79 Malibu, 355cid, stock block and crankshaft, iron heads, Bullet cam, CSU E-85 blow thru, TH400 w PTC converter, BTE brake, Astro Van driveshaft, 10 bolt, 3.08 gears, 3680 lbs:
6.20@114 mph, 1.46 60'
9.70@143 mph, 1.54 60'

'86 Oldsmobile Cutlass Salon 442 - 10.35 @ 68
'70 Cutlass S - 25k miles bone stock
'70 Cutlass S - high compression 350 SBO, Crane 280 cam, 425 heads, 3.90 gears


Don't ask me...people keep telling me I'm doing it wrong.


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 Post subject: Re: 6-71
 Post Posted: Sat Apr 17, 2010 2:53 pm 
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Location: Indianapolis, Indiana
So your getting rid of the sbc and going to build the bbc?.!
A 6-71 on a bbc is a stretch. Depending on which blower you have you may may to turn is really hard to fill a bbc. I am not a fan of the old air heaters anyway.
We just finished a small bbc with a single turbo that made over 1700hp.

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 Post subject: Re: 6-71
 Post Posted: Sat Apr 17, 2010 7:03 pm 
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Location: Dallas,Tx
a 6-71 is alittle big for a relatively stock motor... it's bigger than most people give it credit for..

Chris K.

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1980 Malibu Classic 2-door (gone)
Nitrous small-block Chevy

1979 Malibu 2-door
Blown and injected 377 small-block Chevy

1983 Monte SS
415ci Vortec headed sbc on spray
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 Post subject: Re: 6-71
 Post Posted: Sun Apr 18, 2010 9:38 pm 
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Location: Seaford, NY
I just got screwed out of that motor, so now i still have the 350/290.. so gotta keep my eyes open for something.1700 sounds amazing, but 1 way outa my pricerange 2ithout even asking and 2, wayyyy to much for the street


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 Post subject: Re: 6-71
 Post Posted: Mon Apr 19, 2010 6:49 am 
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Location: Indianapolis, Indiana
h2opunk182 wrote:
I just got screwed out of that motor, so now i still have the 350/290.. so gotta keep my eyes open for something.1700 sounds amazing, but 1 way outa my pricerange 2ithout even asking and 2, wayyyy to much for the street


Depends on a couple of things. Rods, rods bolts, and pistons. Ring gaps as well. What do you have with the blower? Pulleys, Intake, anything. A sbc and a 6-71 could be fun.

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 Post subject: Re: 6-71
 Post Posted: Mon Apr 19, 2010 2:55 pm 
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Weekend Racer

Joined: Sat Nov 08, 2008 3:10 pm
Posts: 96
Location: Seaford, NY
the blower comes with everything, but im just worried b/c i have a 100% stock block except for an electric water pump, that its gonna blow up


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 Post subject: Re: 6-71
 Post Posted: Sat May 01, 2010 9:17 am 
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Joined: Fri Jan 08, 2010 3:38 pm
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Location: Grove Oak, AL
As long as you stay conservative with the boost and timing, the only thing you should have to worry about will be the balancer. I have seen a single keyed stock balancer break turning a 6-71. The devil is in the tune, and from my experience boost is WAY more forgiving than nitrous.

_________________
79 Malibu, 355cid, stock block and crankshaft, iron heads, Bullet cam, CSU E-85 blow thru, TH400 w PTC converter, BTE brake, Astro Van driveshaft, 10 bolt, 3.08 gears, 3680 lbs:
6.20@114 mph, 1.46 60'
9.70@143 mph, 1.54 60'

'86 Oldsmobile Cutlass Salon 442 - 10.35 @ 68
'70 Cutlass S - 25k miles bone stock
'70 Cutlass S - high compression 350 SBO, Crane 280 cam, 425 heads, 3.90 gears


Don't ask me...people keep telling me I'm doing it wrong.


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 Post subject: Re: 6-71
 Post Posted: Wed Oct 07, 2015 10:45 am 
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Daily Driver

Joined: Mon Aug 10, 2015 1:16 pm
Posts: 14
wonder what happened....


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 Post subject: Re: 6-71
 Post Posted: Wed Oct 07, 2015 9:47 pm 
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Daily Driver

Joined: Sun Mar 16, 2014 8:54 am
Posts: 30
Good question.


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 Post subject: Re: 6-71
 Post Posted: Sun Nov 15, 2015 8:20 am 
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MalibuRacing Junkie
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Posts: 15770
Location: North Jersey
Holy thread back from the dead!

Tommy

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20k mile '80 Malibu, currently undergoing long term (aka no money) factory style install LS6 454, Cowl Induction, Legend LGT 700 5 speed. Full Global West suspension, 17" N90 wheels, 12" front/11" rear disc brakes, 9" 3.70 Auburn Pro posi.

"The older I get, the faster I was"


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