Recently Burning Oil...

[GSTAuthor]

Hey guys,

I've got a 'new to me' 66 C20 on my hands that recently began burning oil and having some signs of excess fuel burning as well. My truck has the 283 SBC without modifications.

I began noticing the oil burning increasing about a month ago and checked out the PCV valve first, which was working properly. Being new to this truck, I haven't tried much but that and I also replaced the breather cap on the oil fill pipe because I figured the original one wasn't exactly working well.

One interesting thing is that when I was putting new exhaust on it, I realized that the heat riser was stuck in the up position and it may have been that way for years with the previous owner. I knocked it into the down position, which resulted in more flow out the passenger's side exhaust. That seemed like a good thing, but would that play any role in what I'm seeing?

I should also note:

1. It seems to worsen as the truck warms up.
2. When I hit the accelerator quickly to rev it up, it chokes out
3. When it does get a good rev, it blows both black and blue smoke
4. I noticed that the passenger side valve cover gasket began mildly leaking blue smoke in the past week.
5. The engine does not overheat.
6. The oil pressure used to be in the mid to slightly below mid range, but now it is slightly above mid.
7. Blue smoke is being pushed out of the oil cap breather when running.
8. MPG is about 10.

Those are a few observations. The truck seems to run and drive fine, but isn't always fun driving around wondering how much smoke you're going to be blowing at the person behind you.

Hopefully we can get some thoughts floating around to talk about.

Thanks,

Ryan