ls1 heads
#1
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From: Turners Falls, Ma/Houston, Tx
ls1 heads
What is the differnce other than the valve cover bolt pattern for the ls1 heads between 97-98 and 99 and up, i have been told that 99 and up heads flow better? why is that if its true
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#10
I'm positive the heads up until 241s (late 2000) were all sand casted. Since 243 heads werent cast until them i am sure they used the same media (i forogt exactly what it is) would be used for the 243s also.