The following graphic shows the typical configuration and their respective SAE denomination:
To determine the SAE adaption in your specific application, simply match dimensions XD, XB, XE, XF and XG to arrive at a combination of SAE adaptions for the engine housing and for the engine flywheel, i.e.: SAE#1 Flywheel Housing with SAE#14 Flywheel.
DIMENSIONS in Inches or (millimeters):
Engine Flywheel Housing Dimensions
| SAE No. | XD | XB | Tapped Holes Qty. | Size |
| 00 | 31,000(787) | 33.50(851) | 16 | 1/2-13 |
| 0 | 25.500(678) | 26.75(679) | 16 | 1/2-13 |
| 1/2 | 23.000(584) | 24.38(619) | 12 | 1/2-13 |
| 1 | 20.125(511) | 20.88(530) | 12 | 7/16-14 |
| 2 | 17.652(448) | 18.38(467) | 12 | 3/8-16 |
| 3 | 16.125(410) | 16.88(429) | 12 | 3/8-16 |
| 4 | 14.250(362) | 15.00(381) | 12 | 3/8-16 |
| 5 | 12.375(314) | 13.12(333) | 8 | 3/8-16 |
| 6 | 10.500(267) | 11.25(283) | 8 | 3/8-16 |
Engine Flywheel Dimensions
| SAE No. | XE | XF | XG | Tapped Holes Qty. | Size |
| 21 | 26.500(673) | 25.25(641) | 0 (0) | 12 | 5/8-11 |
| 18 | 22.500(572) | 21.38(543) | .62(16) | 6 | 5/8-11 |
| 14 | 18.375(467) | 17.25(438) | 1.00(25) | 8 | 1/2-13 |
| 11-1/2 | 13.875(352) | 13.12(333) | 1.56(40) | 8 | 3/8-16 |
| 10 | 12.375(314) | 11.62(295) | 2.12(54) | 8 | 3/8-16 |
| 8 | 10.375(264) | 9.62 (244) | 2.44(62) | 6 | 3/8-16 |
| 7-1/2 | 9.500(241) | 8.75 (222) | 1.19(30) | 8 | 5/16-18 |
| 6-1/2 | 8.500(210) | 7.88 (200) | 1.19(30) | 6 | 5/16-18 |
| Delco17.75 | 17.755(451) | 15.50(394) | .72(18) | 8 | 5/8-11 |
| Delco15.50 | 15.500(394) | 13.88(353) | .72(18) | 8 | 5/8-11 |
| Delco12.75 | 12.750(324) | 11.00(279) | 0 (0) | 4 | 1/2-13 |
