Some engines came from the factory with nylon coated timing gears to "quiet" down engine noise. It's been a very long time since I disassembled my 400, but I am thinking Pontiac did not use nylon timing gears on the V8's??? Others experts will chime in.
On the other hand, the 351 Cleveland 4 Bbl in my 70 Mustang had a nylon coated gear and it was falling apart when I tore that motor down in the early 1980's
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
