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Originally Posted by mustangmike351c
I'v had to replace the spider in alot of those for the same things your talking about. the injectors, regulator everythings inside the plenum.
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He's asking what the plenum is. To answer that question, the plenum is the area of the intake directly below or behind the throttle body. This is the area where all individual runners branch off to their respective cylinders.
Also, his car is TBI, which is a veritable carburetor setup, but with electronically-controlled injectors in place of the float/venturi of a standard carb.
A poppet valve is what's used for the cylinders - the intake and exhaust valves are poppet valves. A leaky intake valve can definitely leak into the plenum, but usually intake valves don't leak or get burned under normal use.