Just as my title says what is the maximum bore for a 360 FE??

 

My understanding of overbore sizing is: 30, 60, or 80 over. You need to have the block sonic check if you're thinking of 60 or 80 over.

 

.060" over is usually safe. Get it sonic checked. That will be the final determination. I'd be surprised if .080" wasn't attainable.

That said, why ruin a perfectly good block? You dont gain that many cubic inches. You lose future rebuilds by going way over. The only reason would be to run bigger valves, and you can run CJ valves in a standard 4.050" 360/390 bore anyway.

 

Have notches put in the tops of the bores so that it will breathe better.