318 rotating mass

Anyone know the different weights of cranks/ rods(floating pins) from factory cast or forged pieces I'm trying to set up a very light internally balanced rotating assembly, I have a 318 poly forged crank and rod set up but if I can save weight on eagles SIR I beam rods (605 grams) they're within my budget, redline would be approx 6200 to 6300 RPM N/A, thanx