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^ Does that mean they are the same as the L98 Vette heads? I thought those came on TPI Vettes.
ZZ4 is an alum head with the "fast burn" 62cc chambers 1.94/1.50 valves, LT 4 springs. 210cc intake runner. D shaped exhaust ports. these heads and a .475/.510 lift cam will make 385HP.Good heads will work good with your compo
Since these are for 86-91 vettes, would they bolt right up to a TBI manifold from '87?