1953 f-100

[Diavolo]

Throwing my hat in there. Your drains in the lifter valley are plugged. Get a new intake gasket, pull the intake and, at minimum, run a rod through the valley drains. If it were me, I would probably pull the pan plug and wash out the lifter valley with kerosene and a stiff brush, then pour some fresh oil through the middle of the valley to make sure the cam has lube.

Then fill, run a sludge remover and drain again, then refill.

[Walt Dupont--Me.]

The 8BA breather tube under the intake sticks up into the manifold about 1/8in. It's possible that someone has installed a 59 breather pipe under the intake and there is gap and some how the oil is blowing up into the tube. Tell us what you find after you pull the intake and the oil pan. Walt