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help on raising compression on lq9 6.0...

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Old 07-10-2009, 11:08 PM
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Originally Posted by TurboBerserker
317 heads (stock LQ9) == 72cc (these are essentially 243 heads with different valves and bigger chambers)
241 heads (stock LS1) == 67cc
243 heads (stock LS6) == 64cc

An LQ9 with 317 heads is 10.1:1
An LQ9 with 241 heads is 10.7:1
An LQ9 with 243 heads is 11.1:1
the only diffrence between the 317 and the 243 is chamber size.
ports and valves are the same size, so no loss in flow.
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Old 07-10-2009, 11:17 PM
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I wouldn't say the 317s and 243s are exactly identical. The 243s flow a tad better up top and they also have a more efficient combustion chamber design.
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Old 07-10-2009, 11:52 PM
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Originally Posted by hirdlej
Buy my 60 cc 11deg heads for sale in the classifieds. You'll have more PTVC than you'll know what to do with
Didn't you just buy those heads a few days ago?
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Old 07-13-2009, 02:45 PM
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Old 07-13-2009, 03:19 PM
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Originally Posted by PappyDan
the only diffrence between the 317 and the 243 is chamber size.
ports and valves are the same size, so no loss in flow.
243 valves are LS6 sodium filed exhaust valves. 317s just get SS.
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Old 07-13-2009, 07:45 PM
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Originally Posted by TurboBerserker
243 valves are LS6 sodium filed exhaust valves. 317s just get SS.
+ Hollow Stem Intake Valves
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