Stroked 340 vs Stroked 360

360-based stroker main bearings will last a little longer since they're bigger. Chrysler engineers made them bigger for a reason, the longer stroke of a 360 puts more stress on the main bearings and that's only .27" more stroke than a 340 compared to .69" more for a 4" stroke. Of course we're talking 100,000-mile durability here, power-wise there's little difference.