400 big block

The 400 is basically a big block 340. Bigger bore, but a stroke of a 383. They can run very well without going bigger. But... They have the best main webbing of any mopar big block. So, with the availability of kits, and the fact taht most of the operations are the same...building bigger is easy. Teh 451 is a greta all around package. The 470 is also very nice, and can run well on factory type iron heads. Bigger than that, the costs go up with better head choices. In any case, a real nice 400 build is a 383 crank, forged pistons, stock rods, and a cam that will make peak torque in the 4Krpm range. Then it will rev nice too. The crank is the weakest link. And a 383 forged is a drop in.