LQ4 heads or 243's
01-08-2007, 10:47 AM
#21
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Originally Posted by ap2002
so I have a question, I have a LQ9 with stock 317's, if I get some 243's and get them p&p and maybe milled some, will that be alot better than the 317's??
01-08-2007, 06:54 PM
#22
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Originally Posted by Zick
Yes a P&P 243 will flow better than a stock 317.
I guess most of you already know this but just want to make sure.
yes! it will bring your comp Ratio to around 10.5-11.0.
If you going with N.A. Engine it will give you around 25-30more HP.
But if you going with any kinds of FI or SC. You better off getting comp Ratio down to 9.0-9.5
01-08-2007, 07:43 PM
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Originally Posted by negativeswitches
what CR are the 243 heads on a lq9 i know it's 10.08 stock with the 317 heads
-erik
-erik
i know it's total cyl volume divided by cumbustion chamber but i dont know how to convert cc's to ci's and how much cyl popout is on a stock lq9
-erik
01-09-2007, 12:14 AM
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Originally Posted by BigTex
Should be the exact same CR as the LS2, which is a 6.0L with 243 heads. GM says its 10.9:1 and I calculate it out to ~10.95:1.
:doh: i should have figured that out lol
-erik
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