Join Date: Dec 2002
Location: back in the Hew-Hess-Hay
Re: z-28 pulleys
RJ, here's the real story. You have just learned an important lesson about reproduction foreign made junk. Most of the time they don't fit right.
Tonight I dug out one of my old original #668 CG deep groove 69 Z-28 pulleys and an old original GM #666 narrow groove 69 307/327/350 pulley. There is less than 1/16" difference between the two when they're both mounted to the same damper and measured to the center of the belt grooves. Also, not all the 69 and later pulleys are deep groove. Only the Z28, 396/375 horse, 427/425 horse and 454/LS6 got deep pulleys (except for some Corvettes, which we aren't discussing here). If they were all deep groove the #668 crank pulleys and #456 water pump pulleys wouldn't be selling for $275.00 each. Your problem is with the pulley manufacturer and whoever sold them to you, not with the original GM engineering or David Pozzi or anyone you think isn't sympathetic with your dilemma. We've all had to deal with this cr*p whenever we do anything like you are trying to do. Chill out..... you don't need three threads to answer one question.
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