Originally Posted by dre99gsx
Did you look at your mains bearings? Usually, oiling issues will show up everywhere, including camshaft bearing surfaces. Going to an upgraded oil pump or oil cooler may not have done much as it seems to me you just have wear from racing, particularly at constant high rpm.
Lots of Supra guys running OEM blocks with over 100,000 miles on massive turbos have seen bearings looking like they were never used, but not many guys run the engines at 8000rpm or prolonged track use.
Goodluck! Looks like a maintenance item for these motors.
The mains and the cams were good , the rod bearings are a weakness on the S54 , mainly because they are a bit on the narrow side .