GM Crankshaft Casting Numbers
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 |
