Urban Myths

I have some "71" 340 blocks that were run hard, with over 100K street/strip miles, that measure in the .0002 to .0004 of an inch of wear. Used nothing but leaded gas and conventional oil, SAE 30 changed religiously. OEM TQ and dual point ignition, exceptional tune. 340's had premium rings and machining. Run of the mill engines, without the extreme maintenance, would clean up around .020 or .030 of an inch. I don't buy the better oil argument, both Chrysler Racing and Chevrolet Racing investigated and found no advantage. Don't bother arguing with me, I have enough real world experience to hold my beliefs. EFI is a plus, but only because it keeps "tune" longer and at a higher level than most can achieve.