if you already have the parts they should work fine. the 340 rods were a good piece, fine for mild builds.
however... sounds like you have a forged steel crank and are basing your build around that. if it needs machine work then balancing then you have to find matching parts etc spending a bunch of dollars... you REALLY should reconsider and look at muscle motors or someone for a 408 forged crank stroker kit. they COME WITH the rods and new pistons and a new forged crank and will get you a lot more power. yes you will still need to have it balanced and checked for all tolerances, but the money you save piecing the 340 together is not worth it.
looks like $3899 total for the forged short block already, balanced, from muscle motors. just a kit would be cheaper.
how much will you save doing the 340? after adding all the parts up and machine costs?
Quote:
408” in a 360 race prepped block with Bracket rotating assembly $3899
