Chevy 350 Problems
A few months ago I purchased a 1984 Chevy Camaro Z28 5 speed, the previous owner put a 4 bolt main 350 in it from a 1983 Chevy Suburban. Immediately after purchasing the car I replaced the Mallory Distributor Cap and Rotor With an MSD one as well as Replacing the coil, plugs and wires, they were all burnt up and needed replacing. I gave It an oil change 10w30 and a new filter. I also replaced the Carburettor with a Holly, I believe 600 CFM but I could be wrong. The car had and oil leak, took about a quart a week, I figured it was a mixture between the intake manifold gasket/valve cover gaskets/oil pan(just about all the seals I figured would need replacing) Up until a few evenings ago the car ran great, had all sorts of power but had a problem with overheating which I can't seem to figure out.
A few evenings ago I brought it to a fairly deserted highway and ran it through the gears up to about 5000 rpm except for fifth up till i was going 120, then i decelerated, the car was running just before the red warning lines on the temp gauge. I decided to pull into a parking lot and let the car cool down. I noticed a ticking noise in the parking lot, I killed the car and checked the oil level and was at the add label, after letting the car set a little the ticking seemed to die down some. I drove to a local gas station and filled the car with a quart of oil, this brought my oil level up to the full line. I figured the sound i was hearing was valve ticking, so i removed the valve covers went through each cylinder found tdc(plugged the plug hole w/my finger till air was blown out) I then adjusted the valves by taking a .015 feeler gauge tightened the rocker arms down out it removed the feeler gauge and then tightened it 3/4 of a turn. The ticking went away. I filled all the fluids and drove about 20 miles, car was running excellent. I then took a trip to the local auto-zone to pick up a new taillight bulb and when i left i ran it through the first three gears, at the top of third their was a loud pop/hiss noise as if i lost pressure, the noise was similar to the sound you hear using my method to finding TDC(my oil pressure gauge does not work). There was then a sudden decrease in power across the RPM range, but particularly noticeable at low RPM where the car jerks, and at about 2500 rpm the car feels like the engine is not balanced. The car wants to stall after any heavy acceleration. The car does however in neutral blow out some white smoke. Haven't checked the coolant for oil or vice versa.
What could cause this? My thoughts are...
Bad valve seals
Blown head gasket
Blown Piston ring(s)
Bad plug(they are all new, but possibly one isn't firing?) I did check to make sure all of my plug boots were connected to their terminals
any thoughts? Thank you.
I haven't done a leak down or compression test yet, the plugs are a pain to get at but i checked all of the wires and i plan on getting my oil gauge working buying a new pressure sending unit asap.