Crankshaft Identification
Use these casting numbers to identify the crankshaft you have.
Small Block Casting numbers
Casting Number
CID
Years
Journals
Stroke
Comments
1130
307/327
68-73
2.45/2.10
3.25
Nodular Iron
1178
302
2.45/2.10
3
Forged
1181
305/350
68-76
2.45/2.10
3.48
Nodular Iron
1182
350
2.45/2.10
3.48
Forged
2680
327
2.30/2.00
3.25
Forged
2690
350
2.45/2.10
3.48
Forged
3279
302
68-69
2.45/2.10
3
Forged
4577
327
62-67
2.3/2.0
3.25
Nodular Iron
4672
307/327
68-73
2.45/2.10
3.25
Nodular Iron
310514
350
77-85
2.45/2.10
3.48
Nodular Iron
330550
350
73-75
2.45/2.10
3.48
Forged
354431
262
75-76
2.45/2.10
3.1
Nodular Iron
3727449
283
57-67
2.3/2.0
3
Forged
3729449
265
55-57
2.3/2.0
3
Forged
3734627
327
62-67
2.3/2.0
3
Forged
3735236
265/283
55-67
2.3/2.0
3
Forged
3735263
283
57-63
2.3/2.0
3
Forged
3782680
327
62-67
2.3/2.0
3.25
Forged
3814671
327
2.30/2.00
3.25
Forged
3815822
265/283
55-67
2.3/2.0
3
Forged
3835236
283
57-65
2.3/2.0
3
Forged
3836266
265/283
56-63
2.3/2.0
3
Forged
3849847
283
57-67
2.3/2.0
3
Forged
3876764
283
64-67
2.3/2.0
3
Nodular Iron
3876768
283
64-67
2.3/2.0
3
Nodular Iron
3884577
327
2.30/2.00
3.25
Forged
3892690
350
68-85
2.45/2.10
3.48
Forged
3911001
307/327
68-73
2.45/2.10
3.25
Nodular Iron
3911011
307/327
68-73
2.45/2.10
3.25
Nodular Iron
3914672
327
2.45/2.10
3.25
Forged
3923279
302
2.45/2.10
3
Forged
3932442
305/350
69-85
2.45/2.10
3.48
Nodular Iron
3941174
307/327
68-73
2.45/2.10
3.25
Nodular Iron
3941178
302
68-69
2.45/2.10
3
Forged
3941182
350
68-76
2.45/2.10
3.48
Forged
3941188
350
2.45/2.10
3.48
Forged
3949847
283
64-67
2.3/2.0
3
Nodular Iron
3951130
327
2.45/2.10
3.25
Forged
3951529
400
70-80
2.65/2.10
3.75
Nodular Iron
10106122
350
90-95
2.76/2.10
3.66
Forged LT-5 ZR-1
10168568
265
2.45/2.10
3
Cast One Piece Seal
12552216
346
2.558/2.10
3.62
Cast LS-1 One Piece Seal
14088526
305
1986
2.45/2.10
3.48
Nodular Iron One piece seal
14088532
350
86-88
2.45/2.10
3.48
Forged One piece seal
14088535
305/350
86 & UP
2.45/2.10
3.48
Nodular Iron One piece seal
14088552
350
86 & UP
2.45/2.10
3.48
Forged One piece seal

Big Block Crankshaft
Casting Number
CID
Years
Journals
Stroke
Comments
3520
454
2.75/2.20
4
Forged
3521
454
70-88
2.75/2.20
4
Forged LS-6
3524
454
2.75/2.20
4
Forged
6223
366/396/402/427
68-76
2.75/2.20
3.76
Forged
7115
366/396/402/427
65-76
2.75/2.20
3.76
Forged
7416
454
70-88
2.75/2.20
4
Forged
7463
454
2.75/2.20
4
Forged
336782
454
2.75/2.20
4
Cast
353039
454
70-88
2.75/2.20
4
Nodular Iron
353638
454
2.75/2.20
4
359730
454
2.75/2.20
4
3732692
348
2.75/2.20
4
3732692
348
1958
2.50/2.20
3.25
Forged
3733223
409
62-65
2.50/2.20
3.5
Forged
3733223
348
2.50/2.20
3.25
Forged
3733226
348
2.50/2.20
3.25
Forged
3733226
348
1958
2.50/2.20
3.25
Forged
3741640
348
2.50/2.20
3.25
Forged
3741640
348
59-61
2.50/2.20
3.25
Forged
3741642
348
2.50/2.20
3.25
Forged
3741642
348
59-61
2.50/2.20
3.25
Forged
3788072
409
1961
2.50/2.20
3.5
Forged
3788072
409
2.50/2.20
3.5
Forged
3795589
409
61-62
2.50/2.20
3.5
Forged
3795589
409
2.50/2.20
3.5
Forged
3804816
366/396/402/427
61-76
2.75/2.20
3.76
Nodular Iron
3815822
348
58-61
2.50/2.20
3.25
Forged
3815822
348
2.50/2.20
3.25
Forged
3824553
348
58-61
2.50/2.20
3.25
Forged
3824553
348
2.50/2.20
3.25
Forged
3829027
409
2.50/2.20
3.5
Forged
3829027
409
1963
2.50/2.20
3.5
Forged
3837466
409/427
2.50/2.20
3.65
Forged Z-11Special performance
3837466
409
1963
2.50/2.20
3.5
Forged Z-11
3838416
409
64-65
2.50/2.20
3.5
Forged
3838416
409
2.50/2.20
3.5
Forged
3856223
396/402
65-71
2.75/2.20
3.76
Nodular Iron
3863114
402
2.75/2.20
3.76
3863144
366/396/402
68-85
2.75/2.20
3.76
Forged
3874874
366/396/402/427
66-85
2.75/2.20
3.76
Forged
3879621
427
2.75/2.20
3.76
Forged
3882841
396
2.75/2.20
3.76
Forged
3882842
366/396/427
2.75/2.20
3.76
Forged
3882849
366/396/427
2.75/2.20
3.76
Forged
3887114
396
2.75/2.20
3.76
Forged Special performance
3904815
366/396/402/427
65-76
2.75/2.20
3.76
Nodular Iron
3962523
454
2.75/2.20
4
Forged
3963521
454
2.75/2.20
4
Forged Special performance
3963524
454
70-72
2.75/2.20
4
Forged
3965746
NA
NA
NA
Semi finished Forged crank
3965753
NA
NA
NA
Semi finished Forged
3967416
454
70-71
2.75/2.20
4
Forged
3967463
454
70-88
2.75/2.20
4
Forged
3975495
454
2.75/2.20
4
3975945
454
2.75/2.20
4
3993804
NA
NA
NA
Raw Forged crank
3993878
454
2.75/2.20
4
Forged
10051169
NA
NA
NA
Raw Forged
10114186
427
2.75/2.20
3.76
Forged
10114187
396
2.75/2.20
3.76
Cast
10114188
454
2.75/2.20
4
Cast One Piece Seal
14097044
454/502
2.75/2.20
4
Forged One Piece Seal