i had these done by Gore Performance here locally. i decided i wanted to go with a bigger cam so i'm getting aftermarket heads instead. these are 241 castings, and come with valvesprings and everything. heres basically what they flow:
.100 65/53
.200 135/106
.300 190/145
.400 232/177
.500 263/203
.600 276/219

i also have the complete flow chart showing each cylinder's flow. these would work very well with a small cam, up to a 228.

$450 shipped

 

bump

 

up for the week

 

what size valves? also, what valve springs?

 

sorry for not posting right away. i forget to check here sometimes.

the valves are stock, and i'll throw in brand new ls6 valvesprings for the $450 shipped price.

 

not to hijack, but is there a difference with ported ls1 heads vs. stage 2 ls1 heads?