Mofarmer
Full Access Member
- Joined
- Feb 21, 2021
- Posts
- 55
- Reaction score
- 165
- Location
- Missouri
- First Name
- Mark
- Truck Year
- 1986
- Truck Model
- C10
- Engine Size
- 305
1986 c10 factory 305 engine 52,000 original miles. I bought the truck from PO he had it running but said it had been sitting in a barn for 7 years. The engine runs good but the oil usage is bad like a quart every 350 to 400 miles. Has no leaks no smoking on initial start up but you let it sit idling for 2 to 3 minutes and there's excessive smoke from the drivers side exhaust. Spark plugs on that side are oily with cylinder 5 and 7 being the worst. Compression on that side range from 145 to 155. What do you guys think? Broken rings? No smoke on start up kind of rules out valve seals?