68 gto 4 speed Muncie question
 

What should the diameter of the clutch plate and pressure plate be from factory?

I ordered a replacement from Napa and it’s not fitting according to what the book measurements show. By the size of the one that came out the only one they have that matches calls for a vette. Will that work if it’s the same size?

10.4" is the stock diameter. The same disc was used in all GM cars except for the big block Chevs and 455 later Pontiacs, which used an 11" disc.

Thank you. I guess the vette 10 1/2 should be good..

The good Vette clutch was 10 3/8" (10.375). Just like the Pontiac. The best one was the L88, which is no longer available. I have a few NOS coarse spline L88 discs, but I don't have any pressure plates.