ClassicOldsmobile.com - View Single Post

ndiver63 · 08-25-2006, 08:23 PM

Big Block reference chart:
Casting Number ID Code CID Year(s) Produced Notes
381917 A 425 1965 B Bodies (big cars) only
386525 Red A 425
389298 Bronze B 400 1965 One year only 442 motor. The heads were at a 45% bank then changed
to 39% in 1966, therefore make sure which manifold you're buying.
389244 D 425 1966 - 1967 Big car engine. Toronado is different internally.
390925 E 400 1966 Heads were changed to a 39% bank from the 1965 45% bank.
396021 F 455 1968 - 1972 Most common big block. Two types of "F" letters: stick type, and one with two vertical hangers and a base.
396021 Fa 455 1972 - 1976 Very common casting
396026 G 400 1968 - 1969 442 and Vista Cruiser
231788 L 455 1976 Motorhomes (1973 - 1978) maybe marine use also.

08-25-2006, 08:23 PM	#4 (permalink)
ndiver63 Junior Member Join Date: Aug 2006 Posts: 9	Big Block reference chart: Casting Number ID Code CID Year(s) Produced Notes 381917 A 425 1965 B Bodies (big cars) only 386525 Red A 425 389298 Bronze B 400 1965 One year only 442 motor. The heads were at a 45% bank then changed to 39% in 1966, therefore make sure which manifold you're buying. 389244 D 425 1966 - 1967 Big car engine. Toronado is different internally. 390925 E 400 1966 Heads were changed to a 39% bank from the 1965 45% bank. 396021 F 455 1968 - 1972 Most common big block. Two types of "F" letters: stick type, and one with two vertical hangers and a base. 396021 Fa 455 1972 - 1976 Very common casting 396026 G 400 1968 - 1969 442 and Vista Cruiser 231788 L 455 1976 Motorhomes (1973 - 1978) maybe marine use also.