I finally got around to reading this whole thread. Just recently a 347 Ford stroker we built was run on another dyno. Against all my wishes the owner wanted a hydraulic roller. This engine was to be run with the factory style fuel injection and the factory computer, hence the 224/228 @ .050, .591"/.600", 114 LSA camshaft hydraulic roller. Not being able to tune the computer on our dyno we ran the engine with a single plane and a 850 cfm mighty demon. 400 lb-ft and 450 hp.
Many months later, the engine never having been run that entire time, goes to a difference dyno for the fuel injection tuning. Hydraulic lifter rattle from hell. The boys on that dyno try many different preloads with no success and call me. Good oil pressure, 40 psi idle and 70 psi hot, and this is a new aftermarket block. We discussed going to a solid lifter as I have done successfully before.
Because I wasn't sure if there needed to be a spring change going to a solid on this hydraulic cam I called the manufacture to verify my thoughts. I told him I wanted to run solid lifters and gave him the cam serial number and he asked what spring pressures we were running currently. After I told him, he said, "Try this first......on the base circle, tighten the adjuster until the lifter bottoms out and back the adjuster off 1/4 turn, you'll have a hydraulic lash solid." His cam and his lifters, so...............
When the boys on the dyno tried it they reported back that the engine sounded like a tight lash solid, very little noise, and ran really well. With the long runner barrel type fuel injection intake and the lash that way, the engine made 450 lb-ft of torque and 390 horsepower.
Just something you might try before blowing a wad of money.
