GRD Engine specifications, plugs, etc..
| Green Diamond: | Flat head, six cylinder | 50 net horsepower @ 3400 rpm |
| Firing Order: | 1-5-3-6-2-4, counter clockwise | |
| Spark Plugs: | Champion: J-11, gap: .028 – .032 | |
| Distributor: | Points: Standard #DR-2227XP |
Gap: .018 to .024 |
| Condenser: Standard #DR-50X |
Cap: Standard #DR-413 |
Rotor: Standard #DR-158 |
| Coil: Standard #UC-14X (6 volt) |
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| Oil Filter: | “sock style” | NAPA #1011 |
| Generator: | Regulator: Standard #VR-1 |
Brushes: Standard #RX-51 |
| Fan Belt | Gates #558 gs | |
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The early GRD engine used in the K series used the same 18 mm Champion D-16 plug as the HD series engine