Thread: fresh rebuilt 350 overheating rapidly and extremely low oil pressure

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Oils with more viscosity or pumps with higher volume are not going to fix the problem of excessive clearances in the engine. If you have too much clearance on your mains, rods & cam maintaining pressure is a losing battle. Dave told you initially that a high volume oil pump and a stock pan is a recipe for disaster. You can suck the pan dry before oil can have time to drain back down from the upper end, starving your pump. Did you put in an extra capacity pan, baffled to keep the pickup primed, along with the high volume oil pump?

Are you running a PCV, and if so do you have a breather in the opposite valve cover to relieve the suction pressure of the PCV? Strange as it sounds, that alone can affect your oil pressure.

And just to be clear, what the guys are saying is that PlastiGage is not a reliable measurement method for bearings. If your journal or bearing has any deviation from being perfectly round the PlastiGage will give you a bad reading for the spot where you place it. You need to use inside/outside micrometers, measuring multiple positions on each journal/bearing to know your actual clearance.

Keep the dialog going, and I'll bet that you'll get to the bottom of your problem pretty quickly.

Roger and Dave I pulled a dumb one and put the stock pan on it not even thinking. Roger I had the crank and the block to the machine shop at the same time and had them order the bearings for me to install, now I did not check them with a micrometer before I installed them due to me trusting my machine shop (knowing all to well to error is human). Roger as to the PCV and Breather part, yes to both I have a PCV valve on the left valve cover and the Breather on the right valve cover. I believe we have the oil pressure cause found and that is installation error on my part , I just do not understand the overheating part of it all. So if we can continue on that part, my thoughts are the low oil pressure for whatever reason is causing to much friction in the motor and causing it to overheat? However I do wonder if the there are other causes that I am over looking and can the heater hoses being reversed cause it to overheat?