Estate Sale 427 Tear Down

[earntaz]

I use steel also -- I was just pointing out that certain racers would use the nylon gears for various reasons -- one was Bill Jenkins.

[njsteve]

Way back then, they were new parts! [img]<<GRAEMLIN_URL>>/grin.gif[/img]

[luzl78]

I have a nos timing set for the 67-69 z28. It is the hd wide gears and chain. Should I not use it? I believe the box date is late 80's.

[njsteve]

Is it a nylon or full steel gear?

I am a fan of using modern internal parts when it comes to building engines. No show judge will ever know that you have improved the internals. Metalurgy has come a long way in half a century or so.

[luzl78]

Nylon gear.

[luzl78]

Do you think the nylon has been compromised? Box was just opened.

[njsteve]

Just from the age I still wouldn't use a nylon gear.

[luzl78]

Anybody need a nos hd extra wide timing chain and gears for the 302?

[cook_dw]

Looks like the engine had a little P to V clearance issues on the exhaust side which is common with high compression and larger cam. I would never install a nylon geared timing set on an engine. The nylon can strip under load.. I would not take the risk.

[njsteve]

Those nylon gears were a big problem back in the day. (yeah, I'm old). I remember the first cold day of the season and you'd get several pontiac owners getting their cars towed in for timing chain jobs. One good backfire and the gear would strip chunks of nylon off. If you were lucky the engine would not restart. Otherwise those pieces would make their way to the oil pan and fully clog the oil pickup. After a timing chain job, the better mechanics would always pull the pan and clean out the sump area and pickup to get the debris out.

[img]<<GRAEMLIN_URL>>/scholar.gif[/img]

P.S. I love these forensic tear down threads. Keep going!