331/347 stroker compression?

M

mamatried

New Member

Sep 28, 2004

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Kentucky

Mar 19, 2007

#1

• Mar 19, 2007

• #1

I've searched through a few threads and have read all kinds of info on the 331/347 stroker...still kinda leaving me with NO idea on which is better cause there's so many opinions...i guess it's all presonal preference.

Here's my Question: What would be an optimal compression ratio for a N/A stroker motor. I'm getting the motor from CHP but don't know what comp ratio to get. I won't be adding a power adder right now but in the future who knows. So what's the most compression I can have before I can't add a blower. This really confuses me.

 

5spd GT

"the 5.0 owns all"

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Aug 7, 2002

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Mar 19, 2007

#2

• Mar 19, 2007

• #2

I would keep your static compression to no more than 10:1 if you are planning on boost later.

Keep in mind, you better install the stroker kit in an aftermarket block.

Good Luck with it!

 

N8Miller

I need NOS....make it 2 of the big ones

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Jul 26, 2000

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Mar 19, 2007

#3

• Mar 19, 2007

• #3

if you plan on boost: 9.0:1 would be great. it might be down a few ponies NA, but will work tons better on boost.

 

M

mamatried

New Member

Sep 28, 2004

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Kentucky

Mar 19, 2007

#4

• Mar 19, 2007

• #4

ok thanks man. i was planning on using my stock block and maybe put a main girdle on it to help it out. do you think this would be ok if i decide to keep it N/A?

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

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Mar 19, 2007

#5

• Mar 19, 2007

• #5

Yeah it would be okay with a stock block, if you kept it N/A.

The reason why I stated keep it no more than 10:1, because for one if it is in a stock block it really doesn't matter if you add boost at 9:1, 9.5:1, 10:1, etc., because the supercharger will put enough power to the block to crack it.

So I figured with a stock block, I would keep the compression up there, because likely you shouldn't/wouldn't actually put a supercharger on.

The girdles are nice and can help protect your heads/valvetrain if your block does crack, but it will not prevent the block from cracking.

Good Luck!

 

Grn92LX

Fidanza Man!

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Jan 14, 2001

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Mar 19, 2007

#6

• Mar 19, 2007

• #6

I'd keep it n/a and shoot for 10.5-11:1.

11.045:1 here, full timing and not one single problem on my little pump gas turd bucket

 

M

mamatried

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Sep 28, 2004

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Kentucky

Mar 19, 2007

#7

• Mar 19, 2007

• #7

ok well more than likely i'll keep it n/a anyways so i'll go ahead and shoot for anywhere from 10:1 to 11:1 i guess. i've heard good things about CHP's kits. Even the cheapest kit comes with forged pistons...i think that should be good for what i'm lookin for.