question on 317 heads
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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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.
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Verdad Gallardo 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? 
