Originally Posted by
john8662
Well Done!
Thanks for this excellent contribution to the forum! I followed everything you had said and it all makes perfect sence. I had also heard that aftermarket companies were selling replacement Diamond precups, but they were very inexpensive. Once used in GM heads, they would protrude .002" out of the hole, on a set of heads that had proper depth for a precup (tools are available to reset). So to use them would mean increasing the depth of the precup hole to accept the aftermarket (and probably inferior) precup.
I really like how you group the heads side-by-side, you can plainly see differences externally on the heads on BOTH the intake side and the exhaust side.
I'm also disappointed that they are being difficult with the return.
Back a few years ago I purchased as set of heads from Alabama Cylinder heads. I was advised by Benny Avant (Diesel Depot) that the heads were inferior and that if I could that it would be best to send them back. Alabama Cylinder Heads did take the heads back, with a no-questions asked attitude, even paid the shipping back to them, and refunded the entire costs that I spent on them. I didn't even get to argue, I was out absolutly nothing.
So, it seems that you've found out that the Clearwater heads are no better than the Alabama Cylinder heads. There are differences between the two, I think there are three variants of these aftermarket heads in circulation.