The dreaded nylon camshaft gear.
In regard to the Pontiac GTO, plus other GM models and/or manufacturers.
1964 and 1965 used a Hardened Alloy Iron gear.
1966 through 1972 used that “stupid idea” Aluminum Alloy with Nylon Covered teeth.
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1965 GTO Unrestored Survivor 389 / 335 4 BBL.
1966 GTO Unrestored Survivor 389 / 360 Tri-Power
Early (63-66) Schwinn Stingrays, all Unrestored Survivors
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