Intake manifold blockade?

RogerRamRod said
Can you elaborate on why this will junk an engine?
I tend to clean anything/everything just on principle if I have it apart, but I'm curious about what is so devastating up under there. Old high mileage motors have lots of baked-on sludged-up stuff in them, no?
Obviously, if one was going to sandblast the intake, you'd want to get the media out from under, etc.
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The underside of the intake under the plate will be covered with carbon build up just like the passages in the head. The tin is not sealed against the intake, so with expansion and contraction cycles pieces of carbon can make their way into your new rebuild. Just take the time to clean it out and don't look back.