Join Date: Dec 2012
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1999 had an extra oil passage in the block for the 1999 cam plate. You can upgrade your cam plate to a 2000 model or the 2007-up hydraulic unit and the oil port will need to be blocked off. HD sells a kit.
If using the high volume HD oil pump, you must use the 2007-up support plate as the oil pump sealing face will not work on a 2006-older cam plate.
As well, the 1999 (99A) oil pump is different than the 99B oil pump in that the shim is now 2 shims instead of one thick one and a wave washer was added to keep tension on the veins to not allow for movement and oil psi loss.
The OEM inner cam bearings are INA bearings that lack every other needle bearing. They're not recommended for use by any cam mfg company with any higher lift can due to higher down force and pressure. Torrington makes a replacement. B138 for Evo, B148 for tc88s, B158 for tc96s and so on.
I will say owning a 99 that anyone buying one or early TC's will find this info rather quickly if they do their due diligence.
A simple www. search will yield plenty of reading on the early Inner Bearing failures and people that caught it in time and those that didn't.