I'd like to get a set of H beam rods to replace a set of I beams in a 350. The new rods weigh about 65g more than the originals, I'll be keeping the original pistons. I had this rotating assy balanced before assembling it a while ago.
Should it be nessecary to have the crank balanced again when I put in the new rods?

Thanks in advance

 

Good *** yes.

 

Take no chances... rebalance it.

 

All righty... I'll do that

 

if the mass of the new rods was equal to or very close to the mass of the old rods you could get by without balancing. very slim change the rods would be the same, or close to the same.