Sbm x block

1975 PROSTREET DUSTER said

I understood your comments and was only curious about rumblefish's comment that he has seen/heard of more than a couple being only able to go to 4.04. That would mean a different pattern was used. And is contrary to info i have gotten which prompted me to post this thread. I am going to take somewhere and have bore checked as well as line boring. Thanks

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IIRC, the book says they only go 4.000 safely. I'll have to look it up in the morning for you. The book has been wrong before though.

I'm not sure how Chrysler made it so they only went 4.000 but I know it's strange. In fact, this block I have now is a very early block. I know for sure, because the guy I bought it from bought it new in 1981 IIRC and it was still in the shipping box with the original paper work.

For the life of me I don't remember what year the other blocks were. I guess it could be that later blocks were thinner. Or the early blocks were thought to be thinner, but my block is pretty early so I'm just spit balling.