216 235 261 Flywheel, Pressure Plate, and Clutch Disc Sizes

1937 was a one year only for 216 flywheels and clutch setup, with a carbon throw out bearing and a stepped flywheel.

1938 started what became the standard in clutch design.

1938-41 flywheels use 3/8” retaining bolts, and the center hole is slightly larger than 1942 and later.

The 1938-41 flywheels came in 9” and 10-3/4” clutch  diameter.
These used 3/8” retaining bolts, and the center hole is slightly larger than 1942 and later.
The 9” disc pressure plate had 6 retaining bolts. The 10 3/4” had 9 bolts.
These are for 6 volt starter and have 139 teeth for the starter.

1942 and later flywheels used 7/16” retaining bolts and a smaller center hole than 1938-41.

1954 and later pressure plates have 6 retaining bolts on all clutch sizes. (1954 is a one year only for 6 volt, 139 teeth and 6 bolt pressure plate retaining bolts).

1955-62 (1955 2nd for trucks) are designed for 12 volt starters. They have 168 teeth for the starter.
These came with 10", 10-3/4", and 11" clutch size options.
There were only two pressure plates used, one for the 9-1/2" and 10" disc, and one used for the 11" disc.

You can see by the pressure plate mounting bolt setback from the edge in these pictures, the difference in the three flywheels.

9" clutch

10" clutch

11" clutch