You’ve got questions. We’ve got answers—the Summit Racing tech department tackles your automotive-related conundrums. This week in our Mailbag, we’re tracking down the source of gasoline in oil.
A: The oil pressure fluctuation isn’t really a problem, but having gasoline in the oil is. Like you said, the piston rings should have seated by now. Our guess is that because they have not seated, fuel is getting into the cylinders and your crankcase. You should perform a compression test and a leakdown test. The leakdown test will tell you if the rings have seated or not.
You also may be running the wrong intake manifold. Fords are notorious for having many different combinations of blocks, heads, and manifolds. The correct Edelbrock intake for a 351C with 2V heads is EDL-2750. If this is not the manifold you have, it may not be sealing to the block, or the intake gasket may have moved, causing a vacuum leak. That leak could be the source of your poor performance and the fuel in your oil.