Why not a 413 ?

Jadaharabi said

Why not use the 4.25, 426 piston it is more common rhan the 413 piatons. Your not going to use 383 b block piston in a rb block. Unless you want very low compression that is. Yes you would have to bore it. So what; the 413 blocks are a thick wall casting.
I have an industrial 413, If I ever build it it will be a 426 when I get done with it.

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Mostly because that .0625 cut is usually TOO big. The 413 has a lot going for it in that department though, because they are OLD castings which usually means they are thick. I used the 383 thing as example only with bore size. Sonic test it for sure......and I wouldn't do it unless it had a LOT of material. One bore size worth of "go no go" past whatever the cylinder thickness is ain't enough.