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Is this an original 406 from 62.5-63.5? If so it needs to get outta the barn and into the car. I've had quite a few of those. I can tell you something else....some 406 blocks were cast with 427 cyl wall cores. Not all but some and can be a pleasant surprise if so. Crossbolt bosses might be there as well. Some had them and some didn't. What head and block casting numbers are on it? 4v or 6v induction?
G.
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