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Originally Posted by 1972C10
the 400 sb isnt going to have as much Torque as the 400 BB due to the big block having more reciprocating mass.
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Not totally true, the 396 BB has a 3.76 stroke crank and the 400 SB is at 3.75 and 4.145 bore.
Where the difference is is in the stock heads, BB oval ports let the thing breath. The design lets the valves breath with the bore size that it has. The downfall to the small block getting into that bore size is the limitations of the head design. It shrouds the valves and hinders flow.
I believe Car Craft did a apples to apples (sort of) comarison against the SB 400 and 402 BB with similar builds into a 70 Camaro and the 402 won out everytime (1/4 mile) This was a few years ago, sorry no links.
Me, I like the 400 small block, but in lighter cars. A 402 BB will be at home in your truck's engine bay.
stllookin, thanks for posting those #'s that is what I was after :p