Sorry for the delay, been busy with work. DADS50 here is the number next to the distributer-FO417JC, i would like to know if im running solid or hydraulic lifters. I plan on replacing the valve stem seals. I got myself a new compressor tester and i got these readings- 1-125, 2-110, 3- 108, 4-120, 5-125, 6-110.