...In there
87 J20 with about 70K on it, never been apart before, I actually have to pull the balancer and cover yet, but felt like it might have slack in the timing chain when I set it on TDC.
A few times cold the oil pressure was at the high end of the factory guage running the AMC HD oil, not sure if this is an issue or not, I need to read up on this, sounds like 87 may/may not have the bypass spring.
Put a flowkooler water pump on it last year, ran a little on the warm side a coupple times, I found seepage at the stat gasket, pulled that and found the stat comming apart, so I got that solved.
I don't put a ton of miles on this truck, but use it as a tow rig at times in the summer, so it gets worked hard once in a while.