Originally Posted by YellowRose
I have to take the car in tomorrow for an issue that sometimes it will blow smoke out the driver's exhaust after being driven, then sitting for awhile and then restarted. We think a valve stem seal may not be seated properly...
Originally Posted by elijahbird7
At my mechanic's now. This has that same type of seal you show in your photo which was done during the rebuild. They showed me with the mirror. Problem seems to be the oil pressure is way too high at 2000+ RPM. We did use the spring from the old pump, but he is going to cut the length of the spring a little to see if we can lower the pressure it would put out at driving speed..
Alright, something isn't right at all. Y-Blocks are notorious for poor oiling. There have been many 'oil modification improvements' done to this engine over time, including kits that supply oil to rocker arms THROUGH the valve covers.
You can clearly see that Viton seals have springs holding them on their towers. They do not leak and I have never seen one come loose from any engine. You don't need a mirror to see them as you can see through the valve springs in my picture:
What about oil flow to your rocker shafts?
Are the shafts restricted?
Are the shafts plugged?
There are only two nuts holding each rocker cover on because this engine needs it's solid lifters adjusted during a major tuneup. That means it will be removed frequently (as opposed to a hydraulic lifter engine). When the covers are off, does each rocker arm show good oil flow? The engine only needs to be running for a few seconds to show oil flow. Each rocker arm has two holes; one to receive oil from the rocker shaft and the other to oil the pushrod.
I'm trying to determine if your cam's center bearing is grooved from wear, restricting flow to your rocker shafts.
Cutting the oil pump spring is NOT the answer, especially in an engine that is notorious for poor oil flow. Did someone install a high pressure pump? There's a difference between 'high volume' and 'high pressure'.
When new, my engine delivers ~40-psi at 700-rpm and ~60-psi at running speeds. As the engine bearings wear and the motor loosens up, that pressure will drop. Restriction to flow causes high pressure (like when you put your thumb over the garden hose).
Photo-bombed by my Pointer, Pepper, while hot testing my 'Y':