Hey everyone,

I have a 74 Scout II with a '74 Chevy 3970010 350 swapped in. It has been very strong and given me no mechanical problems at all as a daily driver until the last week or so.

It started when I noticed out of the blue the oil pressure gauge started jumping all over the place when sitting at idle. It would jump 20psi seemingly for no reason.

Then when driving on the freeway recently, 70 for me is a sustained 3k rpm, the engine started ticking from the passenger side. I pulled off the freeway and heard that it was definitely coming from under the passenger side valve cover. I waited 5 minutes, then restarted the truck and drove home on surface street and the tick was gone. (Dipstick reads plenty of oil)

90% of my driving is on surface streets, but want to fix this problem before it gets worse. Looking forward to seeing what you guys think it is (lifter? rocker arm?)