Mopar thrust bearing failure

[Hacksaw]

Originally Posted by Coleydog

Could it be a balance issue after fixing the crank? I'll be running a 340 for the first time and I'm all ears on these small engines.

Unlikely a balancing issue. A 340 is internally balanced and has different journal sizes than a 360.

[James L Miller]

Originally Posted by Hacksaw

Unlikely a balancing issue. A 340 is internally balanced and has different journal sizes than a 360.

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.