Re: 1964 SM420 Clutch question
I switched to the 12 inch clutch back in 1985 because it was an upgrade and a GM pickup trucks at that time came from the factory with 12 inch clutches. As far as stiffness goes it's hard to tell from a change I did 29 1/2 years ago but I felt the aftermarket clutch and pressure plate from "Webber" was a smoother setup than stock.
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