Totally agree. When I bought my car it had a 400 in it. It was pretty tired. I pulled the heads to take a look. It had already been bored 0.030" and had pronounced ridges at the top of the cylinders. The consensus was it needed to be sonically checked to see if it could take a 0.040" overbore. I sold it and moved on.I agree with all the statements above. A factory 400 block is notorious for issues once you start punching them out. The walls are thin to begin with compared to other sbc cores. If you need to clean up walls keep it light like 88ss408 suggested. I got lucky with my short block it is standard bore and clean. I am just going to hone it and rebearing bottom end with some new pistons.
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