Need input here. I'm running a Lunati 612/612 Lift with a 245 / 250 duration @ 50. 112 Deg centerline. I'm getting breakdown in my lifters for all intents, I've got a valve tick even after adjustment. I think I'm at the limit as far as a cam goes while still using hydraulic roller lifters? Is that right? Anyway, I'd like to use solid rollers on this cam. I don't see why I cant, do you guys? And what do you think of this cam for a blower application? I'm pushin' 8-10 pds. with World Casting oval port heads. Thanks for any input.

I've heard of this before by reputable builders. I am pretty sure you can use solid lifters on a hydraulic cam, but not hydraulic rollers on solid cam.

I believe it is all about the ramp profile of the cam. Aggressive requires solids.

There are plenty of cams the same size or larger than yours that run hydraulic roller lifters.

The rpm you are spinning is more of a factor. What rpms?????

Which lifters are you using that are giving you the tick?

When I bought my boat the motors were set up this way. The valve springs lasted about 50 hours. I wouldn't do it.

Mark

Spring pressures are good, springs are Manleys and are not breaking down at high rpm. I run to 6500 or so.

6500 is too much for hyd lifters. Have you tried a bigger prop to get the rpms down. Is it dynoed????

I am having the same problemswith a 600 lift HYD roller cam. Breaking springs and ticking. Generally noisy valve train. I will be going to solid soon as well. By builder says you cant put solid rollers on a HYD cam. There is something about the inital ramp thats different because of the lash. Im not sure but better check it out well. Jas

I agree, 6500 isnt much really for a Hyd lifter. What brand are you running? I'm going to go out on a limb and guess a Comp Cams Type R lifter.

If you havent already, check into the Morel lifters. These things are incredible. I have seen them take 8000 RPM without issue repeatedly.

i have had good luck with isky also, one of the few things that has not failed....All subjct to change the new mill is going for some testing and tuning today