| Name | Brand | Type |
|---|---|---|
| AA - ALTERNATOR GROUP | STH | assembly |
| AB - BLOWER HOUSING AND AIR CLEANER GROUP | STH | assembly |
| AC - CARBURETOR AND FUEL SUPPLY GROUP | STH | assembly |
| AD - CONTROLS GROUP | STH | assembly |
| AE - CRANKCASE COVER/SUMP GROUP | STH | assembly |
| AF - CRANKSHAFT GROUP | STH | assembly |
| AG - CYLINDER GROUP | STH | assembly |
| AH - CYLINDER HEAD GROUP | STH | assembly |
| AI - FLYWHEEL, IGNITION, AND STARTER GROUP | STH | assembly |
| AJ - LUBRICATION GROUP | STH | assembly |
| AK - Shortblock | STH | assembly |