331 stroker question
01-24-2008, 08:43 PM
#1
1st Gear Member
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Posts: 78
331 stroker question
i rebuilt car last summer its now a 306 im wanting to go 331 stoker. what i need to kno is some part numbers for cranks to make it a 331.i haveported and polished heads gt40 heads, bored .30 over, with a B cam. im planning on spraying a 150 shot and a bigger cam. i need part numbers so i can do some research....thanks for any help
01-24-2008, 08:48 PM
#2
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
RE: 331 stroker question
well for the 331..you need to change the whole rotating assembley like rods pistons and crank and gt-40 heads would be a little small IMO for a 331 and you may have to clearance the block a little....I know on a 347 you do...not sure about a 331 but anyway most 331 are 28 oz external balance so you'd need a different balancer and flywheel or flexplate depending if your auto or 5 speed
remember 302 parts make 302 power and if you want 331 power you need 331 parts
remember 302 parts make 302 power and if you want 331 power you need 331 parts
01-24-2008, 10:20 PM
#3
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Posts: 943
RE: 331 stroker question
No block clearancing is needed for a 331. If I had it to do all over again I would have gone with a 347 instead, there is no replacement for displacement. I agree with mjr you are going to need better heads and a bigger cam. What intake are you running?
01-25-2008, 11:05 AM
#4
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Join Date: Sep 2007
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RE: 331 stroker question
302 parts do not make 302 power. That is an exaggerated issue.
Take these 350-370 rwhp 302s. Add 29 more cubic inches.
Do you think you are going to make the same power?
Take your typical 300 rwhp combination out of a 302. Add the same top-end with 45 more cubes.
Do you think you are going to make the same power?
Nope
Killercanary (Paul) had a 304 rwhp 302, with AFR 165s, FTI custom cam, and Performer intake.
He took the same 302 camshaft, AFR 165s, and added a systemax intake. He reinstalled all of this on a 8.8:1 331 (less than his previous compression on a stock 302), and made 356 rwhp and ran 5 mph faster.
So he just swapped out the intakes, lost quite a bit of compression, but added 29 more cubes.
Gained over 50 rwhp and 5 mph with no other changes.
ALWAYS keep in mind the budget.
Take these 350-370 rwhp 302s. Add 29 more cubic inches.
Do you think you are going to make the same power?
Take your typical 300 rwhp combination out of a 302. Add the same top-end with 45 more cubes.
Do you think you are going to make the same power?
Nope
Killercanary (Paul) had a 304 rwhp 302, with AFR 165s, FTI custom cam, and Performer intake.
He took the same 302 camshaft, AFR 165s, and added a systemax intake. He reinstalled all of this on a 8.8:1 331 (less than his previous compression on a stock 302), and made 356 rwhp and ran 5 mph faster.
So he just swapped out the intakes, lost quite a bit of compression, but added 29 more cubes.
Gained over 50 rwhp and 5 mph with no other changes.
ALWAYS keep in mind the budget.
01-25-2008, 01:34 PM
#5
1st Gear Member
Thread Starter
Join Date: Jul 2006
Posts: 78
RE: 331 stroker question
ORIGINAL: 92GreyGT
No block clearancing is needed for a 331. If I had it to do all over again I would have gone with a 347 instead, there is no replacement for displacement. I agree with mjr you are going to need better heads and a bigger cam. What intake are you running?
No block clearancing is needed for a 331. If I had it to do all over again I would have gone with a 347 instead, there is no replacement for displacement. I agree with mjr you are going to need better heads and a bigger cam. What intake are you running?
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