Dave, reading through the parts book, it reads;
29 to 34 all,(exc. - (cc,dc) 3/4 length #816774
33 to 52 all w/216 ......
53 all w/216 15/16 length #820445
53 to 54 all w/235/261 1-3/16 length #1924245
The rotor that that the truck came with and that I have since purchased for it is the 3/4. I added pics to my photobucket of the rotor installed with a cap cutaway, the shaft length, cap length and length. Sorry but I don't quit know how to separate and post them! The extra 3/16 would fill that gap between the rotor and cap contacts. If you look at the old cap contact in the rear of the cutaway you can see the wear from the arc jumping! Thoughts everyone??

Last edited by 53 green 1- ton; 11/16/2015 3:24 PM.
~ Jim Schmidt, Bucks County, PA
1953 Chevrolet 3804 1-ton
In the DITY Gallery