The problem was with engines that had seen enough service to require that much overbore, in vehicles that had never had a radiator reworked. The extra heat transfer to the coolant, combined with a dirty, limed-up radiator and a leaky pressure cap would cause overheating problems. Since the engine was the only thing that had been worked on, the rebore had to be the problem, right?

I always reccomended a radiatior job, and new belts and hoses all over along with the cost of the rebuild. The extra few bucks was cheap insurance, and if the customer refused to go the extra mile, that refusal would void my warranty. A few pepole had to burn up the first engine and pay me to redo it, plus the radiator work, before they saw the light.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!