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