1966 1967 1968 1969 1970 1971 1972 1973 1974 ALL CYLINDER HEAD

Part Number: 12363399

ALL  CYLINDER HEAD - Part Number 12363399
Cylinder Head Assembly Signature Series Oval Port Aluminum. Oval port head made from 356-T6 aluminum alloy for 1965-2000 Mark IV and Gen V & VI 396, 427, 454, and 502 big-block engines with compression ratios below 12.5:1. High-velocity 290-cc intake runnrs enhance mid-range torque and throttle response. Exhaust runner volume is 110cc . Semi-open compression ratios. Rocker studs and exhaust bolt holes are heli-coiled for strength. The 9/16-inch deck surface provides maximum strength and greater head gasket sealing. Head assembly includes 2.19-inch stainless steel intake valves P/N 12366986, 1.88-inch stainless exhaust valves P/N 12366988, 1.55-inch valve springs P/N 12462970, valve spring retainers P/N 12366990, valve spring shims P/N 3875916, valve locks P/N 12366992, and oil seals P/N 12495690. Semi-finished bronze valve guides can be finished either 11/32-inch or 3/8-inch. These parts can be used for service replacement parts. Heads require cylinder bolt kit P/N 126367779. Note: Interlocking hardened valve seats will accept leaded or unleaded gas.
Signature Series Oval Port Alum Bare 1966 1967 1968 1969 1970 1971 1972 1973 1974

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