lq4 or lq9 heads?
#6
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drop the comp quite a bit on the 5.3. I'd just guess from 9.5 to around 8:1
The other thing to consider is the 317 castings have a chamber designed for
a 4" bore engine and the 5.3 is 3.78"...even though you're goin' turbo it's
still not ideal for valve unshrouding if theres a ledge where the chamber
is larger than the bore. Maybe just run a thicker cometic head gasket w/5.3
heads to lower it to 9 to 1
#7
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thats what i was worried about. what would be a better head to switch to? or would it work to bore the 5.3 out to 5.7 specs and use ls1 style pistons?
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#8
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while at the woodward cruise today i had the opportunity to pick the brain of one of the gmpd engineers and i asked him about the lq9 heads on a 5.3 block and he said they would be fine but it required a special head gasket. any thoughts on this?