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Really bad pinging problem with 87 octane gas 200 1979

posted by  austex on  Fri Mar 26 00:56 CST 2004
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last visit: Thu Feb 3 20:55 CST 2011
[RELATED]

"...The head was resurfaced, but I don't believe that they shaved off anything off the bottom of it...."

Not sure how you surface a head without taking "anything off the bottom". A few thousandths off will increase compression ratio, which can contribute to detonation (ping).

I have had to run 89 octane in my 84 245 for years to minimize ping. 285K miles and the head never off. I suspect carbon build-up in the combustion chamber has increased c/r. Did you de-carbonize piston tops while head was off?
--
Tom - original owner '84-245na, ipd 25/25 sways, full gauge set, 283K miles and climbing






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