Hello, I just finished rebuilding my 6.2 liter from my 84 Silverado. today while taking her around the block, the oil pressure dropped to 18 PSI. it is normally right below 40. the only thing i did was top off will a different kind of oil (still 15-40). I also get alot of white smoke. help???

 

does it sound different now?

 

It sounds and runs great. Could the oil pressure have something to do with an injector knock that just started sounding up?

 

As for the oil pressure issue, I had the same thing happen to my '85 K2500 w/6.2.

When I first got it the oil pressure was 80 psi cold and approx. 50 psi warm. 1 day I started it and the cold pressure was approx. 20 psi. I shut it off, restarted and same 20 psi reading. No knocks, ticks ,rattles. I changed the oil pressure sending unit and that cured the low reading.

I figured a sending unit is cheaper than an engine, and a bit easier to do so I tried it and it solved the problem.

If you have a mechanical gauge that's not installed, you could use that for testing/conformation purposes.

Hope this helps.