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Generation III Internal Engine 1997-2006 LS1 | LS6
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Old Jun 1, 2010 | 12:06 AM
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I have a set of 853's and a Set of 317's my question is which would be better planning on porting polishing them and incase of the 317's mill them to keep commpresion
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Old Jun 1, 2010 | 01:53 AM
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mill and pp the 317's. talk to a good lsx engine builder to throw you together a good combo of pr's, springs, gaskets, cam etc.
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Old Jun 1, 2010 | 01:59 AM
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I would sell the 317's and mill and port the 853's. They will basically flow what a ported 243 does at that point.
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Old Jun 1, 2010 | 02:14 AM
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i thought 317's were very similar to 243's, just bigger chambers.

could be wrong, i've never seen the two side by side.
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Old Jun 1, 2010 | 09:35 AM
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^^^ Correct....
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Old Jun 3, 2010 | 02:48 AM
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Either way. He can't run both sets! I just picked one.
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Old Jun 3, 2010 | 02:59 AM
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853
better compression
old

317
better forced induction
better flow
better porting
new

mill porting 317 you win
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Old Jun 3, 2010 | 03:02 AM
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Originally Posted by jaber911
853
better compression
old

317
better forced induction
better flow
better porting
new

mill porting 317 you win
BUT, the CNC program will pretty much make it the same head minus the CC volume.
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Old Jun 3, 2010 | 03:04 AM
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so either way....just pic a set and run with them.
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