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  #1  
Old 30-03-10, 06:57
Lynn Eades Lynn Eades is offline
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Join Date: May 2003
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Its not the valves that wear. Its the heads. I had a customer with a Ford 351clevland, in a truck. it worked hard. (full throttle for long periods). With hydraulic lifters, it kept going until the valves had pounded their way, a full 1/4 of an inch, into the head. We imported some hard seats, and it was never again a problem
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  #2  
Old 30-03-10, 08:21
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cletrac (RIP) cletrac (RIP) is offline
David Pope
 
Join Date: Jul 2003
Location: Eston, Sask, Canada
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Valve wear with unleaded gas is more of a problem with high compression motors especially under hard use. The old low octane tractor gas that was around in the 60s didn't have much in the way of additives and still worked with low compression engines like the CMPs have. I've installed hardened seats in high performance 350 Chev engines to get around the problem but then had the seats come loose in the heads. It's sort of a no win situation. On the 350s I ended up going for heads with induction hardened seats and that worked.
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