Yes. Probably around 10.5 compression. Definitely may be running rich. I will check blow by at idle later tonight. Thanks again for the insight.
I removed the breather hose from left valve cover before I shut engine down for the night. I plugged the valve cover grommet with my thumb while idling 600-700rpm and feel quite a bit of suction/vacuum. I can hear the sucking noise when I pull my thumb off.
I would do the same test while disconnecting/ plugging the PCV valve. If you still have vacuum I would thing intake gasket bad.
Also try using a propane torch without lighting it to poke around the intake and if the engine revs up you have an intake leak.
Just note that while a propane test is easy and can be very helpful, in your case if oil is getting sucked into however many intake ports that may be leaking , that sucking is taking place where a propane test will serve no purpose. I really think your at the point now of getting what you need to either do a leak down test, or pull the intake to see what’s taking place.
I plugged the pcv and removed the valve cover vent. No vacuum. Smoke but not a lot of pressure if I plug the hole. Smokey pulses. I don't notice any smoke out exhaust. Seems like it might be normal at idle?
Doing that will not guide you towards nailing down what the issue is of which I see two that could be the cause. If you do not want to rent or by a leak down tester to rule out rings, then I say it's high time to yank the intake manifold
Just lets review what's happening here so you don't possibly go spending money you don't need to. If all 8 plugs are showing the same basic level of being black & oily, then do the leak down test first. If some plugs are far more oiled down then I would pull the Intake off first to look for gasket vacuum leaks.
Yes. Thanks again. I posted pictures of the plugs on post #7 with the compression test results. The plugs seem fairly uniform. A bit black at base and a VERY slight bit of oil on threads only. The picture of plug #2 (the lowest) may be slightly blacker but they don't seem to me like they are seeing a quart every 200 mi. And no noticeably smoke out exhaust. No misfiring. I may try the loaner compression tester from autozone and see if I can add a port for my compressor. Harbor freight wants $85 for a leakdown tester.
Are you needing a leak down tester or a compression tester? I’m confused If you need a leak down tester, I would buy one and add it to your tools, you’ll find yourself using it quite often for diagnoses. It’s actually more useful than a compression tester.
I need a leakdown tester to diagnose the rings sealing. But if it confirms they haven't seated yet I'm not ready to tear the engine apart. So maybe there is no point.
there is too much fuel change what ever you have to change in that Q-jet to cut the fuel down the plugs are black too much fuel. If you bare washing down walls with too much fuel then it will never seal. Then you guys put in those extended tip plugs and up the timing, there's a disaster waiting to happen. I run 32* total timing with non extented tip NGK plugs 5 gal race gas with 15 gal of 93 and my plugs are brown no issues no oil burning but it will smoke some from sitting and probably leaks down the valve guides but after a trip down the track it is all cleaned up. Highway does same thing. Do the leakdown test, I just did mine and after 25+ years I still get over 90% with 8% leakage at the worst cylinder with most at 5-6% leakage my compression test had them all past 185
A lot of Quadrajets have internal leaks. Does your oil look black and thin and smell like gas? Article Info - Carburetor Parts & Rebuild Kits - Carburetor Parts Superstore! (quadrajetparts.com)
Leakdown tester arrives this afternoon from Amazon. Picture of #2 spark plug pulled again this morning.