I got this off of another site...
The1970 455 HO had D port heads, 4 bolt mains, cast iron intake, factory cast headers, nodular crankshaft, 60 PSI oil pump, for 1971 the 455 HO had the aluminum intake, round port heads, cast iron headers, 4 bolt mains, nodular crankshaft, 60 PSI oil pump.
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