There is a known issue with the factory piston design. They placed the ring pack too close to the top of the piston which eventually leads to a burned ring land. The aftermarket pistons available have corrected this issue. They did it to eliminate the dead space above the top ring and below the piston top for emissions reasons, but it was ill-considered.
Originally Posted by 2oldjeeps View Post
They are very cheap, so may as well get the replacement first, just in case the old one has gone brittle.
I'm pretty sure that the hose that goes to the airbox/intake box (4.7L V8 Power Tech etc) upstream of the throttle body, just connects to the valve covers (the PCV pipe goes to the back of the manifold).
So if the hoses are all ok and your engine doesn't have excess blow-by/knackered stem seals, there shouldn't be much pressure coming out of the valve cover hoses. If the engine's running tho there should be some vacuum into the airbox?
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