Solid roller lifters...

As measured, my old STX-19 was [email protected].

It was ground back in 1972 when RB was in California.
I got it at a garage sale, never run, in 1987 for $25.

I had done the break in with the headers open, and it really sounded bad ***!!
Then, I bolted up my 2.5” pipes with turbo muffs that went to the axle...... and it did not like that one bit.
It was running happy as a clam with the open headers.
With how the carb was adjusted like that......after the muffs were installed, when you let off the throttle it would die like you shut the key off.
I figured the distributor moved. Nope.
I checked everything...... had to mess with the carb more to get it to idle with the muffs.
Took it for a ride, and it was kind of a pooch.
I messed with it for a while, and this was back when I drove it on the street quite a bit........ but I wasn’t happy with it.
I took it to the track once...... took the muffs off...... totally different car.
Ran great like that.

I called RB the next monday(still out in Ca), I told him it didn’t seem to run good with the exhaust on it.
He chuckled and told me........ no, it’s not going to be happy with mufflers.

That was the beginning of my camshaft education.