question on 317 heads
02-20-2009, 07:48 AM
#4
I think you want the most recent ones you can find...as long as they're 317 casting number and aluminum, they should be what you want. I think I heard a rumor at one time or another the later 'version' ones were redesigned to match the LS6 head port design.
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02-20-2009, 12:39 PM
#8
317 is the cylinder head casting number. You can use an LS6 intake manifold with these heads. I was referring to the 317 cylinder heads being a similar port design to that of the LS6 cylinder head, which is why the 317 heads are a cheap 'bang for your buck' head used on many forced induction motors. They not only decrease compression due to their larger combustion chambers, they flow very well too for a factory GM casting.
02-20-2009, 12:47 PM
#9
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317 is the cylinder head casting number. You can use an LS6 intake manifold with these heads. I was referring to the 317 cylinder heads being a similar port design to that of the LS6 cylinder head, which is why the 317 heads are a cheap 'bang for your buck' head used on many forced induction motors. They not only decrease compression due to their larger combustion chambers, they flow very well too for a factory GM casting.
so on a typical chamber smoothing, on a stock ls1........whats the general cr?
02-20-2009, 12:49 PM
#10
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The 317 heads with the "triangles" on the casting of the exhaust port side are the better ones....They are the same casting as the LS6 head with larger chambers. 71.4cc to be exact
