Maybe someone has had a similar problem.....I recently installed a new motor in my K-5. 350 bored 30 over 10.5 compression mild cam and so on running off of a TBI fuel injection system. I built this motor a few years ago , ran it in my own car, pulled it and it sat for two years. Now there is a ?knock? in the motor. It always ran perfect before. I have changed all the rod bearings and the main bearings along with the oil pump and pick up. I still have a knock. When I pull the sparkplug wire out of the #2 cylinder the knocking stops, I honeslty think the sound is the cylinder firing into the exhaust header.... Has anyone else had this problem? Also after the motor warms up the oil pressure drops very low, is it possible it could be the sending unit for the guage? The guage is kind of jumpy so I think it is in acurate. I am in direr need of advice anyone got any suggestions? Thanx , Mike You call that dirty!?