421 SD rods
Any one really good with IDing these rods?
I have many of these rubber forged ones, but two other ones I have check out to be 90% of the way to being SD rods.
On these two the big end width is .985" like a SD rod.
The rod bolt bosses are the taller type like a SD should be .
The GM in the I beam is more pronounced then the rubber rods, but still not as highly definded as I have seen in photos of SD rods.
The machined nut pad on the cap of the rod is like a rubber rod, not a SD rod, so what gives here?
Thanks in advance for any help!
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