3.31” Crankshafts

Some forged pistons, like SRP, are lighter than hypereutectic pistons, at least in 360 applications.

A LA 360 with aftermarket I-beams & SRP pistons will take little, if any, mallory metal. But I would give up a little weight and go with Scat I-beam instead of Eagle I-beam because they are stronger, if you plan to run it hard. I haven't tried it with a 340 but the shorter 3.31" stroke would work in your favor if using a 273 or 318 crank & aftermarket I-beams.

The earliest 273 cranks have a small converter register that the common, later converters won't fit into.

Earlier, lighter 273 rods are weaker & heavier than aftermarket I beams.



Did early, forged 318 cranks come with the 273 style rods & went to the bigger 340/360 style with cast cranks???