aeroflow's small block chevy cylinder heads are designed for entry-level street performance engines and ideal for operating in the idle to 6500 rpm range. made from a356 aluminium castings. these complete heads include larger-than-stock 1.43" (36.3mm) diameter valve spring with damper to handle up to 0.575" (14.61mm) maximum valve lift. recommended spark plugs are 14mm x 3/4" reach with flat gasket seat.head specs:
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