the 400 has the most potential to make better power
(more cubes = more power)
there is a reason why 400 blocks are hard to find now adays.
only real difference is the 400 is externally balanced and the rods are different.
all other parts interchange between the 350 and 400 blocks except the 400 starter is staggered.
all in all the 400 makes stump pulling torque and horsepower over the 350.
hmm thats why im building a 406 as we speak
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