I haveheads on the 'vette that areno longer made. Patriott III heads that were then ported even further and polished by Justin Engineering (which I think is not longer in business). At the time I had the engine put together they were the best heads for the LSX you could buy (it was about a year before the big-port AFR heads would become available) -- Justin's had made 540+ RWHP N.A. on pump gas in a test in Hot Rod or GMHP magazine.

I have AFR big port heads on the Camaro and those are, I think, slightly better (or at least would be if they were polished -- we put them on with the flat, CRC facet lines still there -- wish we had had those smoothed and polished.

I have a custom-grind Crower cam and Crower lifter and pushrod set,andJesel Pro-series shaft mounted rockers, and a set of double beehive springs (I think Crower). This should be good for 7000 RPM although I have the RPM limit programmed at 6600 (which, when I install 3.15 gears, will give 201 mph in 5th gear).