So finally weighing in on the old vs. new. The cast-iron rotors with press-in studs weigh 15 lbs, 13.6 oz. My new rotors weigh 12 lbs, 14.9 oz. So the weight savings is almost 3 pounds per rotor. I'm happy
One thing I was going to install at the same time was dust shields with 2" vents for cooling, but they don't fit with these flat-faced rotors. Kind of a relief, really: that would mean I'd need to drill and tap the spindles, hole-saw the dust shields, weld tubing on them, clearance them properly around the shocks and tie-rods, fabricate a scoop that doesn't look lame, etc. etc. So just doing the straight swap.
It's with everything, just before I put it on the spindle. I borrowed dad's digital scale to use this weekend for a direct back-to-back weighing. Both have press-in wheel studs. I did include the 1/8" steel spacer in the weight for the cast-iron, because I included the same offset in the design of the billet hubs (my CMS wheels wouldn't otherwise clearance the calipers because they're flat).
Here's a pic of the final install. Got some EBC redstuff pads in there too. I can confirm that part number DP3105C fits our front two-pin calipers. For car model, I selected a 1970 Alfa Romeo Montreal REAR pads. DP2105 is the same, but greenstuff. UD030 is the ultimax generic. I'll give an update on performance when these are broken in.
