[WANTED] 273 engine block

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Just a heads up to the 273 people here, any 273 block that is going to be bored .040 or bigger needs to be sonic tested. When the blocks were cast 63-70, they were never meant to be bored .060. I had many years of running a bunch of 273 powered cars in the mid 60's to the mid 70's.
 
I have found that the early blocks are better, 64-66, the later ones are thin, mine is .070 over, but with 3/4 fill.
 
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