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This cylinder head (casting P/N 3991492) was originally installed on special high-performance small-blocks such as the 302ci Z-28 and 350ci LT-1. It is popularly known as the "fuel injection" head because it shares many features with previous high-performance Corvette heads. This head has straight spark plugs, 3/8" screw-in studs, pushrod guideplates, and heat riser passages. The 64cc combustion chambers are machined for 2.02" intake valves and 1.60" exhausts. Seats are not heat-treated.
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