Gross. Time for some engine work.
Not enough of a jump to write home about.
Engine is sick pony. Remove/rebuild.
It's not that.
1. It's not the cam.
2. It's not a burnt valve (wouldn't jump with fog oil)
3. You wouldn't actually want what you think you wish, because then you'd go spiff up the head and plop it back on the block, whereupon it would quickly finish off the tired bottom end.