I'm in the process of doing cam, lifter, and carb upgrades on what used to be a pair of HP500's. I'm trying to decide which route to go with lifters, and Morel's sound interesting. Other than this thread, I've not found much info online for Morel's.

My builder needs to know what the lifter height is on these, both from the roller-to-tie bar centerline, as well as roller-to-cup distance so he can get the geometry right and plan for push rod length.

Is there a Morel website out there? Tech support hotline? I haven't even found a supplier for them. Any ideas?

Another question: did Merc Racing use crane roller lifters in the HP500's? If so, what is the part number? These are 1998 models. Anyone know if there are differences in size between these and the Morel's?

Thanks,
Brian

Morels are a true drop in to OEM specifications and take the stock length Hyd roller pushrod length. They are fully machined from alloy bar stock steel. Morel is a tier one supplier to several OEM vendors and has been in business for 80 years. The marine hyd rollers were extensively tested for idle capability and high rpm endurance runs. There quality is why several people have gone to them. RM builder is a dealer for them, you can contact him.

Chris

Thanks Chris. I've talked with Bob and I'll soon be running these in my setup.

Brian

i just bought 2 sets fropm rm builder they were less than the cranes by 30 bucks. i hear the cranes quality control is weak so i returned them and got the morrels from bob/rm builder. i learned of the morrell lifters hear on this sit. so thx all and thx bob for specing out the cams you had ground for my blower motors. ratman

So, that would be evidence of valve float?? My 454 heads had that issue, was wondering what caused it. Standard rockers, not rollers... Rocker arms on a few cylinders were skewed to one side, guide plates worn. One valve stem was into the retainer, I guess 20 minutes away from dropping

There is a myth that high spring pressure causes the heads of the valve to fall off, or that it robs the engine of HP. The only time the valve head see's these loads is when it's resting on the seat. The rest of the time the lifter,valve,pushrod,ect. is SUPPOSED to stay in contact with the cam.Too little spring pressure is the cause of most valvetrain failures. The hardest thing to fight in the valvetrain is valve bounce witch leads to revision, and most valvetrain problems. Too low spring pressure starts effecting the engine at low speeds and usually is not noticed until the valve actually floats, but all the way through the RPM band you were loosing HP. Most lifter failures I believe get blamed on the lifter, but in most cases it was probably caused by the spring. I would say 150 to 170 pounds of seat pressure for HYD roller, and 200 to 220 for solid roller with at least vascojet material for the spring.

http://www.mae.ncsu.edu/courses/mae4...cts/lifter.mov

Strip, what is that? Hard to make out what's going on.

Brian

Its supose to taking a lifter apart.

They said it takes the lifter apart. I guess the plunger thingy

Bill I am finished with the cast iron. Next is cut the heads and valve job and cc the heads , and mock to make sure on the angles on the intake.slow go.

I am now told there may be some clean up on the intake runners on the Whipple intake