Speedmaster rockers

Your pushrods are not strong enough. Any time you can’t keep the adjuster tight the first thing I look at is the pushrods. IMO they need to be at a minimum 7/16-3/8 single taper. 3/8-7/16 double taper would be even better.

Norris rockers have the same oil hole clocking that Chrysler uses. That means the adjuster needs to be 9/32 out (thats ~.287) plus .050 minus zero. You don’t have much room and to do it right the intake pushrods need to be .050-.060 longer than the exhaust pushrods because of the offset.

Every pushrod manufacturer in the country will tell you their 3/8 thick wall dong beater pushrod is more than good enough and they are all wrong.
Can you put your calculations on the adjusters into layman’s terms? I’ve heard the starting point on adjusters is about 1 1/2 threads showing on the pushrod side prior to setting lash. Is that right?