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Generation III Internal Engine
Milling 317 heads to 241

Generation III Internal Engine 1997-2006 LS1 | LS6

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Milling 317 heads to 241

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Mar 29, 2009 | 07:16 AM

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Milling 317 heads to 241

Is it possible to get a 6.0 317 head down to 241-243 range 65 CC

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Mar 29, 2009 | 03:33 PM

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It should be possible and run a smaller PR, I thought about it(I have 317's on my LS6) but the CR on a stock ls1 w/ 241's is 10:1 and w/ the 317's it would be 9.5:1. So about 10-15 horsepower gain in having them milled down.

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Mar 30, 2009 | 10:55 PM

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What about some 317's milled .030? What CR would that be on a LS1? Sorry to steal your thread.

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Mar 30, 2009 | 10:57 PM

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Quote:

Originally Posted by Venomous281

What about some 317's milled .030? What CR would that be on a LS1? Sorry to steal your thread.

That's about the agreed amount to get them to 243 specs.

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Mar 30, 2009 | 11:09 PM

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Quote:

Originally Posted by Tyler valo

That's about the agreed amount to get them to 243 specs.

Are you serious? They told me not to put them on my 5.3 because i would lose compression.

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