These came stock on 88-91 Corvette L98s. 58cc chambers, angled plugs, 1.94 / 1.50 valves, and raised D-port exhaust. When I bought these heads I had them pulled apart, checked, cleaned and pressure tested. The intake ports were opened up a little and matched to a FelPro 90314-1 intake gasket. They also have sbc 400 steam holes drilled as well (these will not affect anything on a 305 or 350 block).
These were on my 400 for a cam break in, they have only 30-40 minutes of run time since I bought them.
I am including the centerbolt valve covers & breather. The valve train consists of Comp springs good for .525 lift, along with new Comp locks and retainers. Stock stamped rockers are included as well.
I paid $375 for these, and put over $600 into them.
