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Well rusty, I certainly appreciate you spending the time on my behalf. However, I do think this is one of those things I have to answer for myself. I saw a drastic difference in performance between the two heads, the plungers have slight variations, and te 90101 center bolt is a hair longer...

Ok, so why the different measurements the with a plunger the same diameter and length? With my 90101AR head, I was running a max boost of 18psi, but when I installed the 90100 head onto my pump it was only providing enough fuel to give 5psi of boost max. It basically put me back at stock LDT465...

I guess I'm going to have to post the pics here, buy my god is it a pain sometimes.

I took measurements with calipers. The fuel helix on the LDS plunger holds more fuel to distribute on the same stroke length.

I probably will. It's way easier to post pics to Facebook than here. I was snapping pics and posting them as I went. While I have not posted a picture here in probably a couple of years, it used to be fairly troublesome from my phone ( I don't have a computer).

After having my LDS hydraulic head crack, and since I have some spare bad LDT hydraulic heads laying around, i decided to pull both apart and compare. I've come to the conclusion that the only difference is in fact the plunger itself. I verified that the 90101AR plunger fits the bore in both...