Direct Connection RB connecting rods
I got a set of DC connecting rods for the RB. These are old school from the 70ties and they were offered as the P-3690649. Obviously these are not the 649-rod offered as a stronger substitute for the LY-rod. According to the DC catalog from -75 they were as the LY forging but made of better material without adding weight. The DC engine manual I have (P4349340 From the 80ties) has a picture of the 649-rod and it has a casting number P4120516 and the small end is not rounded.
So I did some measuring. The weight of a rod in this set is 1010g +/-1g. Well matched. The length is 6,760" instead of 6,768". Small end 1,090" press fit pin. The small end is rounded and there is no numbers on the beam. I have understood that the Hemi Forgings did not have any numbers on them. So I would think these are the Hemi Forging RB-rods. The confusion is that the Hemi Forging made for the RB P-2531589 should have 7/16" bolts. These I have are with 3/8" bolts. Was such an option also available?
I got a set of DC connecting rods for the RB. These are old school from the 70ties and they were offered as the P-3690649. Obviously these are not the 649-rod offered as a stronger substitute for the LY-rod. According to the DC catalog from -75 they were as the LY forging but made of better material without adding weight. The DC engine manual I have (P4349340 From the 80ties) has a picture of the 649-rod and it has a casting number P4120516 and the small end is not rounded.
So I did some measuring. The weight of a rod in this set is 1010g +/-1g. Well matched. The length is 6,760" instead of 6,768". Small end 1,090" press fit pin. The small end is rounded and there is no numbers on the beam. I have understood that the Hemi Forgings did not have any numbers on them. So I would think these are the Hemi Forging RB-rods. The confusion is that the Hemi Forging made for the RB P-2531589 should have 7/16" bolts. These I have are with 3/8" bolts. Was such an option also available?