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Before sinking ANY money in the machining have cylinder bores sonic checked. I've got a standard bore 230 block 7-31-71 casting date. One cylinder is only .080 thick. 4 cylinders are real thin. Dave

Been there done that, put money into a 400 block that was thin, didn't have it sonic tested first It split a cylinder wall on the dyno

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)