Hi all, I have a bit of a mystery on my hands.
I have gotten my 65 Mustang out of its 8 year slumber. The car has a 250 with a T5, DUI ignition, a 2150 carb on a 2 to 1 plate.
The problem is that the engine makes alot of valve train clatter noise above 2000 rpm. I have checked the compression in all the cylinders and they are all 155, give or take 5. I checked the oil pressure and it is 25ish at idle, but goes up to 50ish under throttle.
What is interesting is that the valvetrain noise is worse under light load, but under heavier load I can get the engine up to about 3500rpm without hearing much valvetrain clatter. I have played around with changing oil, trying additives like Marvel Mystery oil or seafoam just in case it was a collapsed lifter, but nothing seems to make much difference.
Anybody have any idea what this could be or what to try?
I have gotten my 65 Mustang out of its 8 year slumber. The car has a 250 with a T5, DUI ignition, a 2150 carb on a 2 to 1 plate.
The problem is that the engine makes alot of valve train clatter noise above 2000 rpm. I have checked the compression in all the cylinders and they are all 155, give or take 5. I checked the oil pressure and it is 25ish at idle, but goes up to 50ish under throttle.
What is interesting is that the valvetrain noise is worse under light load, but under heavier load I can get the engine up to about 3500rpm without hearing much valvetrain clatter. I have played around with changing oil, trying additives like Marvel Mystery oil or seafoam just in case it was a collapsed lifter, but nothing seems to make much difference.
Anybody have any idea what this could be or what to try?