| Name | Brand | Type |
|---|---|---|
| AA - AIR CLEANER GROUP | STH | assembly |
| AB - Fan housing | STH | assembly |
| AC - CARBURETOR GROUP | STH | assembly |
| AD - CONTROLS GROUP | STH | assembly |
| AE - CRANKSHAFT GROUP | STH | assembly |
| AF - CYLINDER GROUP | STH | assembly |
| AG - CYLINDER HEAD GROUP | STH | assembly |
| AH - EXHAUST GROUP | STH | assembly |
| AI - FLYWHEEL, IGNITION, AND STARTER GROUP | STH | assembly |
| AJ - FUEL SUPPLY GROUP | STH | assembly |
| AK - SUMP AND LUBRICATION GROUP | STH | assembly |
| AL - Shortblock | STH | assembly |