Z/28 engine pulleys OEM vs. aftermarket
 

I'm asking because I don't know. Why OEM cost 300% more than copies ?
are the repro that bad ? And why do the repo ones all say not over 400 HP. and don't go over 6000 RPM . This is a 302 I'm building and want to go over 6000 RPM.
Please enlighten me on pulleys I want to know.
THank You

Because they are three times better. I have all OEM pulleys; crank, WP, Alt and PS.

I bought a cheap set of repops, just because i ran across a great deal. Just for fun, I tried them out and none were perfectly straight. I had no way to check balance, but would be shocked if they were balanced. That is probably why the 6000 rpm warning comes from.

Sold the repops with full disclosure. For looks only.

Z/28 engine pullies OEM vs. aftermarket
 

Thank you very much for your knowledge. I just find it odd that they couldn't copy a pulley that would be as good as the original. It's not rocket science...

Welcome to reproduction parts.

Jason

This ^^^^^^