317 OR 243 Heads LQ4
#1
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317 OR 243 Heads LQ4
I currently have 317 heads on my LQ4 but I have the option to possibly get some 243 heads.. Can anyone tell me what mite be better for my application.. Like I said I am currently running LQ4 motor with 317 heads, MS3 cam shaft, Full exhaust w/ LT's, LS6 intake (I believe) and 150 shot NOS..???? Thanks
317s OR 243s????????????????????????????
317s OR 243s????????????????????????????
#5
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317's and 243's flow just about the same amount of air. The big differance is the cumbustion chamber size. The 243's have a 64cc combustion chamber and the 317's have a 72cc combustion chamber. So on the LQ4 with a dish piston and 317 heads it's at 9.5:1 compression. Stick on some 243's and you'll bump up to 10:1 copression range. More compression more power. 317 vs 243 one is not better than the other, it's just what is the better head for the application.
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Thank you Conan you are very helpful and with that info I think Ill stick to my 317s due to the compression factor.. I eventually want to go FI so dont I want lower comp..???
#7
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In short, If you're planning on boosting it, I'd just keep the 317s and not spend the extra $$ for 243s.