SAE Flywheel Housing Identification
Dimensions in inches, unless otherwise specified.
| SAE Housing No. |
Pilot Diameter “A” |
O.D. “S” |
Bolt Circle “R” |
Housing Face to Crankshaft “C” |
Flywheel Housing Bolts and Bolt Holes “T” | ||
|---|---|---|---|---|---|---|---|
| Qty. | Hole Dia. | Bolt Size | |||||
| 0 | 25.500 | 28.00 | 26.750 | 3.94 | 16 | .547 | 1/2 |
| 1/2 | 23.000 | 25.50 | 24.375 | 3.94 | 12 | .547 | 1/2 |
| 1 | 20.125 | 21.75 | 20.875 | 3.94 | 12 | .469 | 7/16 |
| 2 | 17.625 | 19.25 | 18.375 | 3.94 | 12 | .433 | 3/8 |
| 3 | 16.125 | 17.75 | 16.875 | 3.94 | 12 | .433 | 3/8 |
| 4 | 14.250 | 15.88 | 15.000 | * | 12 | .433 | 3/8 |
| 5 | 12.375 | 14.00 | 13.125 | * | 8 | .406 | 3/8 |
| 6 | 10.500 | 12.12 | 11.250 | 2.81 | 8 | .406 | 3/8 |
* 3.94 for 8″ clutch. 2.81 for 6.5″ and 7.5″ clutch.
SAE Flywheel Dimensions
| Clutch Size |
Drive Ring Pilot “K” |
Bolt Circle “L” |
Housing Face to Flywheel “Y” |
Pilot Bearing Bore “O” |
Bolt Hole “M” | |
|---|---|---|---|---|---|---|
| Qty. | Size | |||||
| 6-1/2 | 8.50 | 7.875 | 1.19 | 2.0472 (52mm) | 6 | 5/16 |
| 7-1/2 | 9.500 | 8.750 | 1.19 | 2.0472 (52mm) | 8 | 5/16 |
| 8 | 10.375 | 9.625 | 2.44 | 2.4409 (62mm) | 6 | 3/8 |
| 10 | 12.375 | 11.625 | 2.12 | 2.8346 (72mm) | 8 | 3/8 |
| 11-1/2 | 13.875 | 13.125 | 1.56 | 2.8346 (72mm) | 8 | 3/8 |
| 14 | 18.375 | 17.250 | 1.00 | 3.1496 (80mm) | 8 | 1/2 |
| 14-DP | 18.375 | 17.250 | 1.00 | 3.1496 (80mm) | 8 | 1/2 |
| 14-3P | 18.375 | 17.250 | 1.00 | 3.9370 (100mm) | 8 | 1/2 |
| 18 | 22.500 | 21.375 | .62 | 3.9370 (100mm) | 6 | 5/8 |
| 18-DP | 22.500 | 21.375 | .62 | 3.9370 (100mm) | 6 | 5/8 |
| 18-3P | 22.500 | 21.375 | .62 | 4.7244 (120mm) | 6 | 5/8 |
