quote:

Originally posted by No Drag:
615 vs 632 which is the best.

Build the pump that best matches your cylinder head capabilities..
Clean sheet, no budget, bigger is better, if it can be built / repaired with shelf stock parts.

I always found that 615 and 632 Run within .01-02 in the 1/8 Mile, but the 632 has more steam in the 1/4.

As long as you get a teardrop cut on the crank weights, the 632's extra stroke won't cause much more windage.