[John Milner]

I have a 428 that I recently rebuilt that smokes at idle once the engine warms up. When you 1st start the engine, it doesn't smoke at all. The engine starts very easy and the throttle is very responsive with no flat spots at first. Once it gets up to operating temperature, it starts smoking at idle and there is a noticeable flat spot when you hit the throttle.

A few things about my engine:

.030 428, TRW pistons, Speed Pro moly rings, hyd roller cam (224 230 .502 .510 112), Lunati HR lifters, 16 heads with positive viton seals (about .040 seal to retainer clearance), Edelbrock RPM intake (can't remember if I used Fel Pro or Victor/ROL intake gaskets), stock valley pan with PCV at the front of the pan running to carb at baseplate. Both valve covers have breathers in them. The PCV valve and hose does have some oil in it. I can run without the PCV valve and it still smokes. There is no smoke or oil coming out of the breathers in the valve covers. I can take the breathers completely out and there is no smoke or blow by coming out of the valve cover.

What could cause this thing to act like it does? I am running out of ideas.

Thanks