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What Robert said. I believe the piston starts getting so short in the 500 inch B block, that you get into longevity problems. Thrust forces, piston slap, etc. Kinda depends on what your goals for the engine are.



This is good to know, longevity is one of my main concerns. I want to build a really stout street motor that may go into either a B or C body. This great info guys, thanks a lot!



For that application, RB all the way.

I have 4.15 stroke RB 493 with Mopar rod journals. At the time they didn't make a 4.25 stroke with 2.2 rod journals. 4.25 stroke with the smaller journals will usually fit with less clearancing than the 4.15 and you get 505 cubes. 505 is better than 493.

I have mine in a 66 C-body. 9:1 E-heads MP509 cam M1 single plane with Holley 950 Commander TBI. 500 HP 600 ft/lbs on 87 regular. Pretty much all done at 5300 RPM. It should run forever.

Kevin