Summit Racing lifters

The first solid cam I ever used in my 440 was a Racer Brown STX-19 that I bought at a garage sale, still new in the box for $25, in like 1986. The date on the cam card was from 1972.

I bought some Milodon “light weight” solid lifters from PAW, which were the dumb bell style.
At the time I didn’t know they were just /6 lifters.

Anyway..... install the cam and lifters, Fire it up...... next to zero oil pressure..... under 5psi.

I don’t remember all the gory details about how the trouble shooting went, but somehow I arrived at thinking the lifters were the issue.
A friend of mine had some of the “normal” smooth body lifters, so I put them in.
Full oil pressure.

Apparently the base circle of the cam was reduced enough that the cut out of the lifter was allowing oil to escape out of the bottom of the lifter bore when on the base circle.
I never used that style lifter again.