Update.
The clutch forks should be hardened steel. The repop clutch fork I used was not.
A stock or common aftermarket pressure plate requires 300 lbs. to move the pressure plate diaphragm. My Center-Force requires 350-375, so more stress on the unhardened clutch fork.
I should receive my OEM clutch fork on Monday, and I purchased a new pressure plate and clutch from the specialty clutch shop, which I installed today.
I am happy to have discovered this shop, they assemble / rebuild clutches, pressure plates, grind flywheels, and have all sorts of tools and machines for testing and servicing these things. The staff is very knowledgeable about all things clutch related.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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