Thread: Completely Rebuilt 427 FE - Still smokes!!!

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My line of thought is figure out at what point the oil is getting in to the airflow.
Is the oil getting in past the intake valve stems?
Are the plugs oil fouled?
Are the rings sealing correctly / seated in?
Is the oil coming in through the exhaust valve stems?
Is the crankcase dealing with positive pressure?
Is the oil draining back properly from up around the rocker arms?

Originally Posted by Lord Antagonism

My line of thought is figure out at what point the oil is getting in to the airflow.
Is the oil getting in past the intake valve stems?
Are the plugs oil fouled?
Are the rings sealing correctly / seated in?
Is the oil coming in through the exhaust valve stems?
Is the crankcase dealing with positive pressure?
Is the oil draining back properly from up around the rocker arms?

The heads are not cut, block is not cut, intake is from a different(same year and make) motor, do not know if it was cut though.
Could that be the problem?
Thank you for your advice.

You say you "completely" rebuilt the engine, but it doesn't sound like that. More like you freshened it up with rings and bearings. Did you have the block professionally machined? Did you have the heads redone?

There are many degrees of "rebuilding" an engine, and if you didn't have the block and heads brought back to specs by machining there is your problem. A "completely" rebuilt engine would have the block hot tanked, new cam bearings installed, the head mating surface decked, the main bearing mating surfaces align bored, the cylinders bored enough to remove any wear and true them up, etc.

Don

Check for intake gasket leaks. They are super common on FE engines. The angles of the gasket surface between the heads and the manifold need to be within .010 in order to seal.

1. Also check the "tubes" that the pushrods run through. I've see porosities through those that introduced oil right into the runners.
2. Remove the rockers & valvetrain.
3. Make certain you've disconnected & plugged all vaccuum hoses or you'll pop the diaphragms.
4. Cobble up a carb plate for the top that'll let you put a couple psi (not much!) of air pressure into the intake with a radiator pressure tester.
5. Brake Cleaner and a strong/small flashlight...