anyone using sollid roller lifters on a hydraulic roller cam or even ever tried just wondering if it works or what the difference is. Any info would be great seeing as i have a good hydraulic roller cam i want to use and a new set of solid roller lifters sitting on the shelf

There's no advantage to do this, but if you want to try, you need to understand the differences. A hydr lobe profile is designed to open the valve at .004"-.006" lifter rise, so if you're going to run mechanical lifters on it, you need to make sure the Hot Lash is set between .006" and .009" with a 1.5 or 1.6 rocker, or .007"-.110" with a 1.7 rocker. This will keep the opening and closing valve velocities at where they were designed to be.
Most people think the opening and closing velocities on a hydr cam are milder then a mechanical cam, but that's not always the case. Some of the more aggressive hydr roller profiles have velocity/acceleration rates up to 3 times higher then similar sized mechanical roller cams, because they can rely on the dampening of the hydraulic lifters to control valve bounce. If you try and run one of these hydraulic profiles with mechanical lifters, it can actually be much harder on the valvetrain, and require more spring pressure then a comparable mechanical roller profile.

Originally Posted by Horndog View Post
On a solid roller set up, it is good to run a "tight lash" cam on vehicles that see plenty of street driving. The theory behind this that with the minimal lash, the valvetrain (cam, lifters, pushrods, rocker arms, and valve stem tips) won't get pounded into submission because the lash (gap) between the roller tip of rocker arm and the valve stem tip is much smaller than a "true" solid roller cam.

This is actually false.
The reason the tighter lash is easier on the valvetrain, is because the velocity/acceleration is lower at the tighter lash point. If the cam is designed with a constant velocity lash ramp, the velocity/acceleration at the lash point won't change with the tighter lash, so it won't be any easier on the valvetrain.
It's all about the velocity/acceleration rates at the point you lift the valve off the seat, and when you seat it back down. The amount of lash is irrelevant. If's like you were bouncing on a trampoline, and you hit your head on a 9 foot ceiling, compared to hitting your head on an 8 foot ceiling. The distance you traveled is irrelevant. The pain comes from the force you hit the ceiling with.