theoretically... I have a few 350 blocks if anyone wants to bore one out to 4.181, just sittin there in Nebraska without cranks. I doubt they would just use the extra iron, they have different casting numbers, and cast in designations in more than one place on the block. Why would they have an extra 1/8" of iron around the cylinders on every 350 block, the bean counters wouldnt have let that one slide.
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