Originally Posted by veltboy314
A couple days ago I heard some ticking from the passenger side of my engine so I pulled the valve cover off thinking one of the rocker arms came loose & I was going to tighten it up. I know oil come out of the push rods & run down back into the engine but the passenger side had nothing. I checked my oil gauge to make sure my oil pump was working & it was reading 20 psi so I pulled the drivers side valve cover to see if oil was flowing normally on that side & it was. I ruled out the push rods because I pulled a couple of them to make sure they were not clogged or bent. I noticed there is oil on the ground on the rear passenger side of the engine and some coming down the starter dripping onto the header. I was thinking the valve cover on that side was leaking but I stuck my hand back there & it was dry. The motor wasn't rebuilt recently but it has been rebuilt. I bought it from a friend over a year ago & didn't have any problems out of it. I pulled the motor out of one car & put it in another car about a month ago. I broke the rotor in the distributor & somehow the wires to my pick up coil broke too so I dropped another HEI distributor I had laying around in after i bolted the engine in. I had it on the engine stand to clean it up, change the oil pan gasket & paint it... Do you think having it upside down caused something to go wrong? The only other thing I did while I had the engine on the stand was use the guide that I quoted below to adjust the valves. maybe I did something wrong here that caused this...IDK
Have anyone heard of oil only coming through the push rods on one side of the engine? If so, how was this fixed... If it can be! The engine is a Chevy 355 & the block # is 3970010. As I was sitting here typing this I remembered that I did not put the distributor gasket on. Do you thing that air could be getting into the engine & causing the oil pressure to drop in that side?
Oh boy, the lack of oil from the push rods on that passenger side and oil coming down the back side of the block sounds like the the plug on the right side oil galley is leaking. This is the galley that supplies the right side lifters and from there the push rods to the rockers. The galley is drilled all the way thru the block front to rear as are the other two being the main in the center and the left, drivers side lifter galley.
The right side galley is also intersected by the distributor housing. The bottom of the housing has a thick boss with a relief in the middle of it. The relief forms a passage for the right side lifter galley. If the distributor is not positioned in the vertical direction correctly, it will allow oil from this galley to leak internally back to the pan. There should be a gasket between the distributor and manifold if it is missing the distributor will set to deeply into that galley and plug it partially to fully and can also result in a leak at the galley as well as out the mating surface of the distributor to the manifold.
Milling the block, heads and intake can also play havoc with this as the vertical mounting dimensions of the distributor are affected which usually sets it too low and blocking of exposing the oil feed of the right side lifter galley by miss-positioning the groove in the lower boss of the distributor housing. For engine's that have been milled, it is necessary to shim the distributor to get the correct tooth engagement with the cam gear and to insure the oil groove centers around the oil passage.
Check to see if the oil source is off the bottom of the distributor or whether it's coming out behind the flywheel/flexplate. In the former its a miss-located distributor in the latter the rear galley plug is leaking.