small block hyd. roller lifters

turbodart68 said

The rocker will break under the load required to control the heavy hydraulic roller lifter. Spring pressures are much higher than a hydraulic flat tappet. Also depending on the lifter you will need to bush the lifter bores or the lifter will leak and the motor will have low oil pressure.

Click to expand...

You're right, the heavy valve springs that are required for Hyd rollers will break stamped rocker arms.
There are hydraulic and solid roller retrofit lifters that you can use without bushing the lifter bores, I've run both in my stock block LA 340 on the street without any oil pressure issues.
Ya just gotta do your homework and run a high volume oil pump.
That being said I will never run any type of hydraulic lifter again.