I have a 1966 427/390 that is using oil and I can not seem to find the problem this what I have done to date.
The engine was completely rebuilt recently. The heads have bronze liners and new ss valves as well as new springs, teflon seals,etc. The short block was bored and honed, rods resized, crank cut, as well as all the regular rebuilding steps. Moly rings were used. The cam bearings were changed with the ones recommended by Federal Mogul. The catalog indicated that the use of these grooved bearings was a substitute for a grooved camshaft. After firing the engine it was discovered that the valve train was starved for oil. The engine was removed, the cam machined with a groove and re-installed. This solved the oil problem. The current problem is that the engine smokes after idling for a few minutes. It is burning oil at the rate of 1 quart every tank and a half of gas. My first thought was that the guides or valves were damaged by the lack of oil with would allow the oil to run past the seals and burn. The heads were removed and it was found that the oil is heavily burned on the back of all intake valves, but not on the valve stems at all. there is no evidence of oil coming down the guides.There is oil in all intake runners as well as in the runners of the intake manifold. The pcv is new and the pcv has is pretty dry. The engine has stock valve covers with the factory baffles in place. The oil above the intake valves is what has me so confused. The engine seems to run very well and has good power.Could this possibly be a ring problem?
Thanks Tony
The engine was completely rebuilt recently. The heads have bronze liners and new ss valves as well as new springs, teflon seals,etc. The short block was bored and honed, rods resized, crank cut, as well as all the regular rebuilding steps. Moly rings were used. The cam bearings were changed with the ones recommended by Federal Mogul. The catalog indicated that the use of these grooved bearings was a substitute for a grooved camshaft. After firing the engine it was discovered that the valve train was starved for oil. The engine was removed, the cam machined with a groove and re-installed. This solved the oil problem. The current problem is that the engine smokes after idling for a few minutes. It is burning oil at the rate of 1 quart every tank and a half of gas. My first thought was that the guides or valves were damaged by the lack of oil with would allow the oil to run past the seals and burn. The heads were removed and it was found that the oil is heavily burned on the back of all intake valves, but not on the valve stems at all. there is no evidence of oil coming down the guides.There is oil in all intake runners as well as in the runners of the intake manifold. The pcv is new and the pcv has is pretty dry. The engine has stock valve covers with the factory baffles in place. The oil above the intake valves is what has me so confused. The engine seems to run very well and has good power.Could this possibly be a ring problem?
Thanks Tony
Comment