I was only putting in new bearings,liners and pistons. There is a tractor rebuilding place (Keystone Tractor) near by, he recommended that I install new injectors($67 a piece) if one wasnt working it could ruin the rebuild. Im wondering if I should take the front cover off and check all the gears.I wasnt going to install a new oil pump. Had the head checked over and a few of the intake valves were leaking. Head was pressure tested and its fine. Cleaned block grooves where o rings go really well and checked liner protrusions. Putting it together today. Going to check my oil cooler again to make absolutly shore its not leaking. By the way, when I was collecting all the parts yesterday, I needed a ring expander for the piston rings, I tried harbor freight but theirs was too small. I thought I would ask the tractor shop if I could borrow one. Here was a guy that never saw me in his life, and lent me his own personal set. Lately my thoughts about people in general has been pretty crappy, not with the folks on this site, but with people I considered friends, shootings of little kids,and adults. Here was a genuinely honest trusting person who was willing to help in my time of need, and asked nothing in return. If I ever need a tractor shop Keystone Tractor in White Horse PA is where I would go and recommend to anyone. I will post back on how things go. Thanks again.