I'm going to be assembling my 350 pretty soon and I was wondering if balancing the rotating assembly would be worth it. The reason I ask is because I have a new eagle crank, new h-beam rods, and new pistons. The rods are within +/- 1 gram. Shouldn't this setup be very close already?

 

Those H beam rods are probably 100 grams heavier than the previous ones you had. I am not sure that matters but it seems to me that everything will be of different weights (than previously) and thus not balanced.

 

In addition to matching all of the rods to each other, and the pistons to each other, etc., the counterweights on the crank need to be matched to the total reciprocating mass. Unless (a) you are re-using a crank that is known to be balanced with a specific group of other parts, and (b) you can measure the weights of what you took out and make what you put back in the same, then any time you change any of the moving parts, you should have the assembly balanced by someone with the right equipment.

 

i got an eagle stroker crank and eagle h-beams and i got word from eagle personally that the crank is balanced in itself but no where close when you put a reciprocating mass on it. mine was way off. took 5" of heavy metal tungsten steel to internally balance my crank.

 

absolutly must balance it, they only time you can sneak away without balancing is when your reusing the stock crank, rods balancer and flexplate

 

Is it ok to use the stock flexplate with a balanced assembly??

 

think of it like this... you are about to walk across a tightrope over 2 buildings.... would you rather be sober and balenced or a little drunk and give it a shot???