forged crankshaft

KB243 for the 340 IIRC. (The KB167 is for the 318.)

.030 over KB243's and the ligher SBM rods are gonna be REAL close to the standard 273 bobweight. It'll all depend on the exact parts and how they weigh in; the KB's can be a bit lighter than published, and the rods can be lighter or heavier. And the crank itself can be under or over target bobweight.

If you end up with the pistons/rods being a bit heavy and the crank a bit light (where weight added to the crank would be one solution), other solutions to consider are:

• Taking weight off the rods, pistons or pins
• Drilling holes in the ends of the 1-2 and 7-8 journals like the 340 were done
• Putting in a set of lighter piston pins

So if it comes to it, those are some options to explore with the local machinist.