Big Block Chevy Crankshaft Part Numbers
Casting # Year CID Comments/Specs/RPO's/Applications
330570 427 truck,1053,forging number 6223
336782 1970-74 454 with automatic transmission
3879621 1967 427 L-88, See Note 1
3882841 1965-71 396 See Note 2
3882842 1965-69 427 forged, cross drilled, balanced for 11:1 CR
3882849 1966-69 427
3887114 1965 396 tufftrided, 5140
3963521 454 4 in stroke, 5140, raw forged
3963523 1970-71 454 LS-6, See Note 3
3963524 1970-71 454 LS-7, See Note 4
3965746 1965-69 430 raw forged, semi finished, 3.4-3.8 stroke
3965753 1970-72 495 raw forged, semi finished, 3.9-4.25 stroke, 5140
3967811 1968-69 427 L-88/ZL-1, See Note 5
3975945 1970 454 with manual transmission
3993804 427 raw forged, 3.75 stroke, 5140
3993878 1971-72 454 LS-6
10051169 454 raw forged, 4340, 3.75-4.25
Note 1: L-88, with 3/8 in bolt rods, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 2: forged, cross drilled, 3.76 stroke, tufftrided, balanced for 11:1 CR
Note 3: 1053, tufftrided, cross drilled, balanced for 9.25:1 or 11.25:1 CR, forging number - 3520 and 7416
Note 4: 4 in stroke, HD, 5140, LS-7, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 5: tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115