I believe the Aluminum/Nylon gear was designed to reduce noise and harmonics in the valvetrain, but heat and contamination damaged the nylon very quickly, turning it brittle and hard. May have been a cost saving as well as there was little machining done to the gear, just the cam bolt area, the rest was molded. One left me stranded in my 69 Plymouth Satellite with a 318 at around 100K. At least the 340 came with a double roller timing chain with cast iron gear from the factory.
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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