They are an old set of heads off a D/SA 72' Corvette. (LS5) I am part # restricted by the rules for the Pure Stock Muscle Car Drags. (72' LS5 calls for part # 3999241 cylinder heads)) They are milled to 100cc, from 113cc factory. Multi angle valve job, tulip cut stems on the stainless valves - lighter + more flow, all of the valve springs are set to the same installed height. Doing all we can with stock parts to get this pig to run hard. They have been coated with Glyptol before I got them too, helps the oil return back to the pan. I'll give them a coat of Chevy Orange tomorrow.
NHRA factors the 71' & 72' LS5s @ 390 flywheel HP. I'd like to stick it on an engine dyno to break it in, tune it, and get some real #'s. But, not in the budget right now. I'll settle for chassis dyno #'s when I get it running. If it's between 365-390 @ the crank, it should make around 245-265 RW on a dynojet. TQ will be about 320-345 RW.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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