Thread: Lifter Mystery

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If the engine builder said to zero lash the lifters, then they have to be hydraulics. With the motor warmed up and running, loosen each adjuster nut, one at a time until it clatters, then tighten it down 1/2 to 3/4 of a turn.

Any solid lifter needs some "play" or lash so that the valve will be on the seat for a little while to transfer heat to the seat. Otherwise, so much heat will build up in the valve that it will warp and presto....you have a burned valve and zero compression. If you find out these are solids, lash 'em at 0.025" cold as a starting point.

Originally Posted by DennyW

Pro Magnum Lifter™ Instructions for Part #’s 858-12, 858-16, 862-12, 862-16, 863-16, 865-12, 865-16, 867-12, and 867-16
All Pro Magnum Lifters™ require an adjustable valve train for proper operation. Lifter preload should be set to .002”-.004” (hot settings). These adjustments should be made similar to the adjustment for a
hydraulic lifter camshaft.
Care and Inspection:
Remember, when using solid roller lifters, the only oiling the lifters receive is from windage created by the rotating assembly. Excessive idling or very low RPM usage may cause lack of oil supply to the lifters and cause premature wear to the axles, bearings or roller wheels. This can result in extensive engine damage.
Roller lifters should be inspected periodically for wear to the wheels and or bearings. If valve lash has to be corrected more often than normal, this could be an indication of accelerated lifter wear. Periodic checks are beneficial in determining if your roller lifters need to be rebuilt.
COMP Cams® offers a rebuild program for our solid roller lifters. This procedure includes magnafluxing and polishing the lifter bodies, replacing the axles, bearings, wheels and lock rings for a very nominal charge.
If you have any questions regarding our roller lifters, our rebuild program or any other COMP Cams® products, please feel free to contact us Monday through Friday, 7am-8pm CST via our CAM HELP® line toll free at 1-800-999-0853.

The (scorpion) rockers are rated very high as being one of the best. Every where I checked said that about them.

DennyW :
Thanks for the research.I think what you have stated is what I needed to know. The engine I purchased was built some time ago by a Tony Sizemore in Nashville Tn. for the person I purchased it from. He had no cam card to furnish me and that left me in the dark.all I have are the engine specs.and mfgr.names.I may give comp cam a call tomorrow and see if they have any record of the engine builder.I tried the white and yellow pages but struck out on finding the builder.Thanks again for the help.

Don In Austin