He may have jumped a tooth on the passenger side cam sprocket.

To check, put the engine on TDC (compression stroke), remove the passenger side cam sprocket cover and see if the sprocket mark is aligned with the mark on the passenger side rear cam cover.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum