Truck engines did not run hydraulic lifters, so if the stamped number beside the distributor indicates it was originally installed in a truck, it came from the factory with a solid lift cam. Schneider Cams in San Diego California can put any lobe shape you want on a cam that's not badly worn. Be sure to get the lifters reground along with the cam- - - -used lifters installed on a new or reground cam will probably destroy it. Pull the pushrod cover off the side of the engine and remove one lifter. If there is a wire snap ring at the top of the lifter and a removable plunger in the middle, the lifter is hydraulic. Hydraulic lifters cannot be swapped onto a solid cam, nor will solids work on a hydraulic cam. The lobe geometry is different.
Jerry
