My understanding is the early 400 and 425 rods are close to 7" in length.

I would like to know-

1. the pin diameter
2. the rod journal diameter on these cranks
3. the big end width of the rod.
4. what is the interchange on these close to 7" rods? In other words, what is the entire useage of Olds rods at this dimension.

thank you,

Steve Barcak

 

They are exactly 7" center to center, same pin .9805 (pressed in rod) and rod bearing diameter (2.5"; 2.6242-2.6250" hole in rod) as later 455s. I have lots of spare rods. All 65-67 big blocks used this rod, 400 and 425. All 400-455 from 68 up used the 6.735" long rod.