| Note | Description |
| 2 | [2] Requires machining on cylinder heads. |
| 7 | [7] Stock springs cannot be used. |
| 23 | [23] Includes special shafts & spacers. |
| 27 | [27] Special 10º locks, 1/2 2 groove, 1/2 set 4 groove. Single groove use part #612-16. |
| 28 | [28] 3-Bolt core available. Change first 2 digits of part # to 23. |
| 76 | [76] Oils through pushrods. |