Charlie Petty Posted Friday at 04:38 AM Share Posted Friday at 04:38 AM Can anyone confirm the year of this engine by the stamp shown in the photo? The characters appear to be: 460W 3750. I found a list of serial numbers that indicates Wilmington DE assembly, 1960. Thanks, Charlie Link to comment Share on other sites More sharing options...
pont35cpe Posted Friday at 06:25 PM Share Posted Friday at 06:25 PM I`m not familiar with those numbers, but cubic inch size is usually on the left side of the block(#1), just aft of the fuel pump. Would this help.. All 421/428/455 blocks have a "TRANSFER LUG" cast into the block near the distributor hole. 1955-1958 blocks had no side motor mounts, they used a mount under the timing cover All blocks prior to 1964 had the casting number on the passenger side of the block. 1964 & up have the casting numbers by the distributor (Except 421's) 1959 thru 1969 blocks have 2 motor mount holes 1964 was the start of block mounted starters Starting in 1965, cylinder head oiling passages were eliminated from the blocks. 1955 thru 1966 have 2 freeze plugs per side. All the above information was taken from Pete McCarthy's "Pontiac Musclecar Performance" book. Date Codes: J23= October 2,1963 D083= April 8, 1973 (or 1963 !!) The letter is the month, followed by the day (one or 2 digits) and the last number is the year. 1 Link to comment Share on other sites More sharing options...
pont35cpe Posted Friday at 06:29 PM Share Posted Friday at 06:29 PM Some more.. Years CID Casting Number: Notes: 1955 287 518037 1956 316 521560 1957 347 523293 1958 370 528456 1959 389 532000 1960 389 536387 1961 389 538181 1961 421 SD 538181 no transfer lug 1962 389 538181 1962 389 542426 Stock Replacement 1962 421 SD 538181 no transfer lug 1963 326 538211 1963 389 543680 1963 421 544988 1964 326 9773153 1964 389 9773155 1964 421 9773157 1965 326 9778840 1965 389 9778789 1965 421 9778791 1966 326 9778840 1966 389 9778789 1966 421 9778791 Early Year 1966 421 9772611 Late Year 1967 326 9786339 1967 400 9786133 1967 428 9786135 4 bolt main 1968 350 9790079 1968 400 9790071 1968 400 9792506 Ram Air 4 bolt 1968 428 9792968 4 bolt main 1969 350 9790079 1969 400 9790071 1969 400 9792506 Ram Air IV 4 bolt main 1969 428 9792968 1969 303 546313 1969 400 9792968 Ram Air V 4 bolt main 1969 428 545887 Ram Air V 4 bolt main 1970 350 9799916 1970 400 9799914 1970 400 9799914 Ram Air III ( 4 bolt) 1970 400 979991 or 9799915 Ram Air IV (4 bolt) 1970 400 481708 4 bolt main 1970 455 9799140 1971 350 481990 1971 400 481988 1971 455 483677 HO 4 bolt main 1971 455 485428 Late HO 1972 350 481990 1972 400 481988 1972 455 485428 1972 366 (485)212 1973 350 488986 1973 400 481988 1973 455 485428 1973 455 (490)132 SD no transfer lug 1974 350 488986 1974 400 488988 1974 455 485428 1974 455 (490)132 SD 1975 350 488986 Early 1975 350 500810 Late 1975 400 481988 Early 1975 400 500557 Late 1975 455 500813 1976 350 500810 1976 400 500557 1976 455 500813 1977 400 568557 1978 400 568557 1979 400 568557 1 Link to comment Share on other sites More sharing options...
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