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ps- otherwise you end up with this, cracks and pinholes, etc. http://board.moparts.org/ubbthreads/showflat.php?Number=7843503

always better to check it first with sonic, rather than poke and hope just make sure they calibrate the sonic tester. I can make a wall measuring .050" sonic test at .150" by purposely mis-calibrating the tester the block has to be measured somewhere with a mechanical gauge, then the sonic...

old thread but worth comment- I have a sonic tester and have checked many blocks, various makes, for myself and a few local shops. the 340 Mopar will go .060" but the resulting cylinder wall thickness may be as low as .095" on the nonthrust walls, between the middle cylinders. you should...