I thought the LS6 heads were also known as 243 heads which is on my car? Its the same heads on the LS2 engines that come in the 05/06 GTO (which is one of the main reasons why the 05/06 have the higher 50hp besides 6.0L right?)...and if i missed the longtubes part, I also have that installed.. sorry bout that..Originally Posted by NevrNufTorq
not unless there's one SERIOUS port job in those ls6 heads and it'd have to have a bada$$ cam/tune to go with it. those are just the heads off a 02-04 c5 vette. great heads but not all that jazzy w/o some real real massaging on a c n c mill and prob have to have bigger valves too. ls2 heads flow more than these in any stock form
with a great tune prob put in the neighborhood of 380-410 if you get some longtubes imho
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