340 damage dilemma

my68barracuda said
That is not correct, if the sleeve and the original bore are in very close contact with each other as they should be for a press fit, the sonic wave will penetrate both and report back the total thickness. The only way only the sleeve would be measured would be if there was a cast iron sleeve in an aluminum block, with the tester calibrated to iron the iron thickness would be reported.

Well, I've seen it first hand on several sleeved blocks. I don't know what to tell you. I wouldn't have said it had I not experienced it. Two of the blocks were aluminum with factory iron sleeves, so they were done at the factory. I've even sonic tested two Ford 8N blocks for the heck of it. They have drop in sleeves.