241 heads on 5.3= lower compression?

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Oct 27, 2008 | 02:34 AM

03supercharged

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Staging Lane

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From: Minnesota

241 heads on 5.3= lower compression?

Hey guys, Im in the process of getting things ready to put a 5.3 turbo motor in a regal, I was wondering if a set of 241 heads would lower the compression on the 5.3 motor allowing me to run more boost with pump gas, or will the stock 5.3 heads be better. The only reason i ask is because i have a set of 241 heads in the garage that are getting no use, and if they would be benificial to be, that would be great!

Any help will be appreciated,

thanks,

Josh

Oct 27, 2008 | 02:39 AM

z28berryhill

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i think your right beacause the combustion chambers are bigger theres more fireing room = less compression

dont quote me though

if im wrong ill buy your heads lol

Oct 27, 2008 | 02:49 AM

ZMONSTER!

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theory seems sound. What are the size of the 5.3 chambers?

Oct 27, 2008 | 08:11 AM

sroach20

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yeah, its like sticking some 317s on an ls1.

Oct 27, 2008 | 09:27 AM

Jon@Texas-Speed

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241 = 66cc chambers and 862 (5.3) = 62cc chambers. It will lower your compression.

Oct 27, 2008 | 12:50 PM

5.3LJimmy

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From: Napoleonville, LA

The 241 heads with a stock MLS gasket will put you at 9.0:1(Stock 5.3 is 9.4:1). Sounds like a fun project!

Oct 28, 2008 | 12:05 AM

03supercharged

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Staging Lane

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From: Minnesota

alright, thanks guys for the info, looks like ill be using them then

, now do i use the 5.3 headgasket or the 5.7 headgasket?

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Oct 28, 2008 | 07:29 PM

03supercharged

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Staging Lane

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From: Minnesota

ok, thanks man

Dec 13, 2008 | 07:37 AM

#10

03supercharged

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Staging Lane

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From: Minnesota

sorry to bring this back up, but people have been telling lately that i would be better off leaving the compression ratio at 9:4:1 on the stock motor with the turbo. What do you guys think? Would dropping the compression to 9:0:1 be better with the turbo or would I lose horsepower by dropping it? I plan on running around 10 psi with the mp70 turbo.
Any help will be great!
Thanks