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Technical Information
Pontiac 400 428 455 Engine Casting Numbers

Pontiac Bore & Stroke Figures

Pontiac 400 428 455 Engine Codes

Pontiac 400 428 455 Engine Casting #s

Pontiac Cylinder Head ID #s

Service Replacement (SR) blocks do not always have a code stamped on the front of the engine. They do, however, usually have a casting number. This casting number is usually on the RH side of the rear portion of the block - where the transmission bolts up.
Here they are:


400

Year Numbers
1967 9786133
1968 9790071
1968
Ram Air
9792506
1969 9790071
1969
Ram Air IV
9792506
1970 9799914
1970
Ram Air IV
9799915
1970-74 481988
1975 488986 (early) 500557 (late)
1976 500577
1977-79 568577
1978-79 (T/A 6.6) 481988 xx


428

Year Numbers
1967 9786135
1968-69 9792968


455

Year Numbers
1970 9799140
1971 483677 (early) 485428 (late)
1972-74 485428
1973-74 (SD) 490132
1975-76 500813