FWIW we have built a LOT (comparatively) of Pontiac engines using an SD455 block as the foundation. They have consistently had the thinnest cylinder walls of all the 455 engines we have checked. So any folks looking to get rid of those junk thin wall blocks, I would be happy to take them off your hands, I'll supply with a nice 455 block with thicker cylinders and even set up the freight on my end.
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