If you have a 25 psi drop in one cyl than you have a prob there, cheak for coolant/oil lose with blue or black smoke. A good test is start the truck with the radiator cap removed, if water comes out of the radiator when you are turning over the engine thats a blown head.

Pull the plugs,or if you remember, what color were the tips?

92' Pick-up, SAS, gears to make her crawl, 37's , bullet proof motor, and alot of time invested.
06 CRF450R one mean roost flinging machine