[Danr55]

I just finished rebuilding my engine. I have open chambered heads in a '71 Cleveland. The heads had hardened seats or I would have installed them. As it is, I went with Manley valves and Comp Springs. It's a sad thing when an engine starts loosing compression because of a burned valve or seat. I've heard of guys rebuilding Clevelands and other motors without hardened seats with no problem. I've also heard of more motor that lost compression because of burned valves and/or seats. Why risk it?