Quote:
Originally Posted by Dave Noll
If it was me, for .0001 I'd dig those 60 stock forgings out of that junk pile.
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Dave, it was my Manley Hemi Pro-I Beam rods that went .0001" out of round after resizing. The big end spec on the Mopar BB rods are 2.5000" to 2.5005" per the Clevite book. I'm assuming that the 383 rods wouldn't repeat within the ,0005" range. I'm sure that was with the stock 383 bolts. I wasn't around when he went through the rod testing on the 383 rods, so I don't know the exact procedure done.
My engine guy also does hardness testing on the rods. I bought a set of Manley 440 Sportsman rods and they were in the HRC 26-29 range. It appears to me that is the normalized hardness for 4340 steel. The hardness on the Hemi I-beams were in the 31.5-39 HRC range (corresponding to 130 ksi to 159ksi yield strength per the EMJ Blue Book charts). Maybe Manley saves money on the Sportsman rods by skipping the heat treatment and final sizing after heat treat steps?