Quote:
Originally Posted by Milwxman
My Timing was set to factory settings. The manifold is from a 1969 (non-EGR). I have a 6 bladed flex fan and no fan shroud.
Enigine has a larger cam in it. I do not know the specifics, but I was told it was it is similar to the 68 HO cam.
Something I noticed was the oil pressure. At start up it is running a strong 60 psi. After the engine heats up the pressure starts to drop a little. At about 2000 RPMs after warm the PSI is only 40. Could the oil be thinning out too much and lower the lube factor and increase the heat?
I had a buddy that had this build on his 77 400 and he had the same issue. Hot Start and high temps. He added a shroud and it did not help his issue.
I appreciate any insight on this, the engine only has about 60 miles on it after being completely remanufactured.
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You may have several issues here:
1 - you really don't have a 1977 engine anymore. With a more aggressive cam, older intake and higher compression you've duplicated the '68 specs. Go with '68 timing or just play with to a more advance state.
2 - no fan shroud IS a problem. The air needs to be directed through the radiator to cool properly. Do you also have the air dam below the radiator area? That deflects air up towards the radiator. Without it you will lose additional air flow.
3 - oil pressure will always be higher when cold. It will drop when the engine warms up. 40 psi at 2,000 rpm? Could be OK ... compare readings as the engine gets more miles.
4 - 60 miles since the rebuild? They are always tight when fresh which makes them run hotter.. Get some miles on it and that will help.
5 - someone else in this post mentioned waterpump divider plate clearance. The massive post regarding "chalk one up for the cat impeller..." is very long, but very informative. If you don't know the tolerance between the divider plates and the impeller I'd pull the pump and double check. Doesn't take much time when compared to overheating your engine.
6 - you have driven it 60 miles, but how much on the highway and at what speeds? Without a fan shroud your air flow below 40mph probably isn't very good.
None of the above will cost much money ... just time. Best to spend the time and research all possibilities before overheating your new engine.
Good luck.