1967 Z-28 Parts Wanted

[JoeC]

Did they have a tapped hole in front of crank? I have one with notch rear flange no tapped hole in front. Seems strange that they relied on just a press fit to hold the H B on.

[Salvatore]

I believe they did Joe. Sam

[RPZ28]

Sam, it would be impossible to wear the tuffriding surface off. The nitriding process is about .015 thousands deep. The crank would have to be .030 under to be completly gone.
Zedder I have a 67 z28 crank #3815822 std.- std. for $400.
let me know if you are interested.
Ron

[Zedder]

Thanks Ron, but I just bought one from another forum member.

[Salvatore]

Ron, I have 2-1969 302 cranks. One is 20/20 and the other is standard. I guess the one that is standard still has the tuffride, and the other one 20/20 is gone? How can you tell? Thanks, Sam

[RPZ28]

Sam, the only way to tell is to do a rockwell"C" hardness test on it, but the diamond tip from the tester will leave a small prick mark on the journal. The only problem with nitriding is that it is the hardest at the surface, the more you grind off the softer it gets. Yours at .020 under still should have some hardness left, at .030 under its usually complety gone. I hope this helps.
Ron

[Salvatore]

Thanks Ron. I thought that the hardness was only about .015 thick at the most,but You learn something new everyday! [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img]

[RPZ28]

Sam, the .015 depth is radial, and .030 is total depth on the diameter.
Ron

[rafbody]

I have not checked the 283 cranks I have but if it is a 302 crank, I am pretty sure it was tapped. The 302 had an 8inch harmonic balencer where the 283 had a much smaller one.

Russ