H.P gain from 317 to 241 head

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02-19-2007, 09:54 PM

ls1blazer

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H.P gain from 317 to 241 head

I just bought a stock lq9 engine and was thinking of swapping heads, installing a 228/228 cam and a ls6 intake.

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02-19-2007, 10:01 PM

Rhino79

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You'd be better off either milling the 317's or getting some 243's. The 241's don't flow like the 317's but they will bump the compression.

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02-19-2007, 10:16 PM

ls1blazer

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say .30 ?

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02-19-2007, 10:17 PM

Rhino79

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I was gonna say like .040"-.045".

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02-19-2007, 10:49 PM

Studytime

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.030" and a thin gasket will have you at nearly 11/1 compression with the 317 heads (and a flat top piston). The LS6 styled heads (317s) have an advantage in unported form over the 241 heads by around 25 cfm at peak flow. Being you're using a motor >5.7L, I'd pick the 317 heads as they also have a larger runner.

Ben T.