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BELLHOUSING ID CHART
| Year | Application | Casting Number |
| 1963-64 | 289 | C3AA-6394-C |
| 1963-64 | 390-406-427 | C3AA-6394-A |
| 1965 | 289 5 bolt block | C3AA-6394-C |
| 1965-67 | 289 6 bolt block | C5DA-6394-A |
| 1965-67 | 390-427-428 (11" clutch) | C5AA-6394-A |
| 1966-69 | 390 GT (11 1/2" clutch) | C6OA-6394-B and D |
| 1968 | 289-302 | C8AA-6394-A (aluminum) |
| 1968-69 | 302 | C8AA-6394-B (cast iron) |
| 1968-69 | 390 GT - 428 CJ (11 1/2" clutch) | C8OA-6394-A |
| 1968-69 | 428 CJ-SCJ (after 2-15-68) | C8OA-6394-A |
| 1969-73 | 302 | C5AA-6394-B |
| 1969-70 | 351 | C5TA-6394-A |
| 1969 | 390-428 (11" clutch) | C9AA-6394-C |
| 1969 | 428 CJ-SCJ | C6OA-6394-B and D |
| 1969-70 | 429 | C9AA-6394-D |
| 1970 | 428 CJ-SCJ | C6OZ-6392-C |
| 1970-71 | 429 Boss (after 2-2-70) | C9AA-6394-E |
| 1971 | 351 | D1TE-6394-AA |
| 1972-73 | 351 | D1TA-6394-AA |
Bellhousings that will be used with a Toploader must measure 6 1/4" deep. If it measures 6 3/4" deep it is a truck bellhousing and should not be used.