Roller Rockers Geometry

FASTBACK340

I tried running the non adjustable stock type rockers but had very little success with them. I had the push rods go slap through the rocker TWICE! I checked to see if I had the proper length push rods and it was confirmed that I did. I would buy a rocker and compare it to the damaged one and the quality looked the same so I was afraid of them. This happened on the low performance 273 with hydraulic cam. So on my 360 I didn't want that problem and wanted the extra horsepower that roller rockers produce. In which I find it hard to believe but on Comp Cam page it says 15 to 30 extra HP.