Don't worry about it- - - -you'll wear out the cam in a short time, and then you'll be able to swap cam and lifters together. You'll ruin your new lifters in the process. If you've run the new lifters on the solid cam for more than a few minutes, they're not suitable to swap to the correct cam.
A solid-lifter cam has "acceleration ramps" that take up the clearance gradually, then start lifting the valve. By running the hydraulics, you've effectively increased the duration of the cam lobe by lifting the valves on the acceleration ramps, but the lift rate is so gradual there won't be any increase in performance. The idle will be a bit rougher, and the manifold vacuum will drop slightly, which makes it difficult to get the engine to run smooth at low speed.
Hydraulic cams also have acceleration ramps, but they're very short, usually no more than 2 or three thousandths before the quick lift rate begins. Ditto for the closing ramp, there's a very short area of slow-rate movement to prevent the valve from slamming down on the seat. Your solid cam will have a longer deceleration area than the hydraulic cam. Always change a cam and lifters together. If one is worn, the other won't benefit from putting new parts against old ones.
Edit- - - -I just re-read your post, and saw that you put used lifters against a different cam than the one they were used with originally. They won't last more than a few hours until everything is worn out. Tear it down and swap for a new cam and lifters now, before you fill the engine with debris from the cam lobes and lifters as they destroy each other.
Jerry
Last edited by Hotrod Lincoln; 04/29/2012 3:13 PM.
