I just finished dealing with a carburetor flooding issue which was detailed in an earlier thread here. Now it runs very well but there is a billowing cloud of light blue smoke when I accelerate. I'll list the series of events here, hopefully it will give you all some evidence as to what's going on without too much unnecessary details. Fixed carburetor flooding issue Went for a victory drive and it was billowing a lot of light blue smoke (more than now) even at idle Removed oil plug after victory drive (while warm) and let oil drain for a few hours while I ate spaghetti Oil smelled like gas Removed mechanical fuel pump and installed block off plate (electric pump was installed by P.O. who left mechanical pump attached to engine but disconnected the fuel lines) Plugged vacuum line that ran to fuel pump Replaced oil filter Filled engine with 4qts 30wt dinosaur oil and 1qt "Lucas Engine Oil Stop Leak" Drove it around for ~3 or 4 hours and needed to add 1qt of oil as indicated by my friend the dipstick This is where it stand now. The smoke is not noticeable at idle but is a billowing cloud on acceleration, especially if I am going uphill. The smoke is not really that bad on deceleration/when engine braking downhill. It seems to have gotten slightly worse over the past week but that could be all in my head. I did a compression test today while the engine was still decently hot and these are the numbers I got. (test was done by removing one spark plug at a time) Cylinder - Without squirt of oil/With squirt of oil 1 - 90/100 2 - 93/103 3 - 93/110 4 - 90/110 What I believe happened was that the mechanical fuel pump failed and started leaking fuel into the oil. This prompted the P.O. to install an electric pump but they never replaced the oil. The oil got thinned and when I got it running right was leaking past the rings/valve guides causing the huge amounts of blue smoke initially. My questions are these, Do these compression numbers mean my rings are worn and need to be replaced? Is it worth looking into the valve guides as the source of the oil or should I go straight for the rings? Could some of the oil/gas combo have been left in the engine during the change and be causing the current oil to thin and leak into the combustion chamber? (I just smelled the dipstick and it doesn't smell like gas). Thanks for all of you help folks I couldn't do this without you.