I need to know how to find the weight of the rotor for my rebuild

 

The weights should be standard based on year. You can use the year of your engine to look it up. Or, you could weigh them.

 

But there are letters that are stamped on it. Another thing I was told you can go up or down one letter and it will still be balance. Is this true?

 

u can use A and B, or B and C, but not A and C. r u rebuilding an already complete engine or r u mix and matching different parts to make a complete engine?

 

well the engine is complete but i need a new rotor and housing to finish it up. the rear rotor is damage beyond repair and the only letter i seen on the rear rotor was a d. but i heard they are rare to come around.