317 heads on a 5.3

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05-24-2010, 02:37 PM

pooper78

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317 heads on a 5.3

i am doing research on building a 5.3 turbo. i was just wondering what the compression ratio would be on a stock 5.3 w/ 317 heads & how much boost would it hold w/ 118 race gas? thanx for any help!

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05-24-2010, 07:49 PM

pooper78

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would this swap be worth my time & money?

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05-25-2010, 11:33 AM

Orangemagic

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I know the 5.3s seem to take to boost real well. As for compression i don't know but would like to know. I know the 317s are a 72cc or so head.

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05-25-2010, 01:28 PM

kdavis

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Compression is about 8.5-8.6

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05-25-2010, 07:53 PM

pwrtrip75

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I figured it out at 8.6:1 also. I had them on my 5.3L for a few years... they worked great. Make sure you use the 6.0L gasket though.

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