Quote:
Originally Posted by Hacksaw
Unlikely a balancing issue. A 340 is internally balanced and has different journal sizes than a 360.
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Except for the 1973 cast crank 340. It has a special balancer on the front, but probably could be internally balanced with lighter rods and pistons (that part should be easy with the stock 340 slugs). All the rod journals are the same size, the 360 has larger main journals than the other SB Mopars.