Be sure to modify the TA pump cover to control oil pressure. I just built a StageII on-center with a H.V. version of the TA pump cover and it would make 150+ psi at idle
. I found that the bypass passage required the regulator valve to move .200" farther than a stock pump cover before it would start to bypass any oil. The pump is very efficient but the by-pass needs to have the port radiused into the valve seat to get it to bypass oil correctly. I also spent consider amount of time milling the oil pump surfaces flat and true to the pump cavity, radiusing all oil galleries in the block, too. Lifter bores have a .060" hole. (bushed) Control the hemmoraging and you don't need as much oil. I also had to cut .375" off of the 40 psi spring for the oil pump. I ended up using a -8AN return hose to the fuel pump block off plate. A -8AN temp installed in the pass. valve cover would fill it in about 20 seconds at idle. The TA heads do not have enough oil drain back for that kind of volume.
If you have an issue and want clearer directions, PM for my number. I tokk an entire weekend to sort out the problem, and clean up 6 qts of oil on the shop floor from blowing an oil filter o-ring out.
