Originally posted by Bob Parmenter
Just a silly notion that proper use of teminology matters.

Fuel of adequate octane rating will control detonation, but preignition can still occur despite that correct octane rated fuel.
looks like to me there has been something missing from this thread and that is the dif. in octane ratings. you're talking 93 now and in the 70s hay day it was what 97 plus. until you get the same octane fuel in the motor, its no way to compare anything. you could build a faster motor on pump gas in the 70s than you can now. with the EFI its about evened it self out, but as far as the lubrication part goes until i see some proof ill stick with what ive been told all my life.its been at least a 1/2 dozen threads on replacing the valve seats in the older heads to harder ones because there was no lubrication in un lead fuels like it was in the leaded fuels, on this forum in the last mo. and this is the first time ive heard anything about no lubrication being in leaded fuel. you went way over my head on most of your post bob but i think im reading it right. if not let me know.