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Thread: What are 317 heads ?
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03-08-2012, 11:32 PM #1NYSpeed.com
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Pewter- 2002 z28 A4
What are 317 heads ?
What are 317 heads and will they fit a ls1 ?
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03-09-2012, 03:14 AM #2Old Member, New Username
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Green- 1995 Z28 w/ LS1 Swap
Off a LQ9. There the same as 243 heads w/ larger (72cc) to lower compression for FI
Heads/Cam/Intake/Stall.
404 Rwhp uncorrected @ 6400
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03-09-2012, 09:27 AM #3NYSpeed.com
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Is it good to use if I doing have forced induction ?
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03-09-2012, 09:28 AM #4NYSpeed.com
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Is it good to use if I don't have FI ? ***
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03-09-2012, 09:55 AM #5Veteran
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Red- 02 35th LE Camaro SS
From how I understand it to work...and I'm no expert...
317 heads are designed for a 4.000" bore motor. Your LS1 is a 3.900" bore motor. Therefore, you'll need a thicker gasket on your heads.
Stock heads are 67cc and you are going to a 72cc. This is going to drop your stock 10.5:1 compression down some.
As far as power increase? Don't know. Typically you want to bump compression up if you're staying N/A.
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03-13-2012, 03:52 AM #6Old Member, New Username
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Green- 1995 Z28 w/ LS1 Swap
From what Ive read most say if your not going to go forced go w/ the 243's....they say even after milling you'll still be better off w/ the 243's
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03-19-2012, 11:53 AM #7NYSpeed.com
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How about 862 aluminum heads ? I heard they were good for bumping up compression.
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03-23-2012, 06:56 PM #8NYSpeed.com
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..........hello ..........
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03-26-2012, 09:34 AM #9Old Member, New Username
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Green- 1995 Z28 w/ LS1 Swap
862's are off earlier 4.8-5.3 motors
Last edited by BrownsMillsAntz; 03-26-2012 at 09:37 AM.
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