Cab,
The cam is a MP .590 solid that I had in my other engine. The cam, lifters and push rods are the only internal parts that are out of the other engine. Different stock 440 block & crank, Stealth heads, Ross pistons and Ohio Crankshaft rods.
I really need to find an explanation for this before I just feed it some more parts.
I adjusted the valves using the old Direct Connection chart (sticker on firewall). The cam card calls for .028" intake & .032" exhaust. I actually set them at .026" and .030" cold and was warming the engine to rest them hot.
I'm amazed that it back completely off in that short of time, even if it was left loose.
I'm a Diesel truck mechanic (we're "techs" now) and we had 25 2000 model Macks that would be fine, sometime for 50K miles, no one touched them, then would back off a adj screw lock nut, kick the push rod out and sound like it had "blown up". Always exhaust. Mack couldn't tell us why.