I was looking at the spec's for the 360magnum rods and they are listed as being 6.117" long v/s 6.123" for the pre mag rods. Is this correct? also has anyone used the magnum rods in a pre mag build? is the big end the same size as the pre mag as far as witth(wide)
I can get a set of rods and pistons resized and hung with oversize pistons for 140$ this is a good deal if they will work in my 79 block and crank. how much comp will i loose with .006" further in the hole?
It will cost me an extra 100$ if I have to buy the pistons separate and have them hung on my rods not to mention my rods have not been resized.This is a truck motor low rpm towing.

Magnum rods are 6.123" long the small end of the magnum rod has a smaller width and the magnum rod is lighter than the LA rod.

Is there enough weight difference to cause a ballance consern The .040 over pistons may make up the differance? Or if I was to use the mag rods should I use the mag damper and flywheel weights?

magnum rods weigh about 14 grams less than LA rods on the small end. If it were me I would rebalance

IIRC the LA rod is thicker at the small end and needs to be ground down to fit a mag piston/pin

I think I'll just pass on the prehung pistons and stick with the rods I have and get new pistons hung on them. This is a low rpm truck motor so factory balance should be fine.