Last build was with 5.7" stock 250 rods. I clearanced the crank by turning it round in my lathe as small as possible. Then set up on my milling machine to roll on the crankpins. Had a bar on the flywheel flange to roll the crank under the milling cutter for final clearance. With 6" rods you might not need to do the second milling operation. Then I had a local shop grind the crankpins to 2.0" and 4.062 stroke. I try to do as much as I can myself but I don't own a crank grinder or balance rig. Yet.
I thought about altering SB rods by adding material to the big end. I bucked up for the Crower rods so never tried it. I would avoid welding on the crank.
2.0" crankpins and 4.062 stroke almost clears the fuel pump lobe on a 250 camshaft. Slight grinding on the rod plus reduced fuel pump lobe diameter will clear. I altered the mechanical pump to compensate for the reduced lobe. This won't be required if you use a 292 camshaft and electric fuel pump.
I'm going to run the same Comp 252 cam with altered fuel pump lobe to start with. Already own the parts. Then figure out what to do from there. I would like to run a roller, solid or hydraulic.
