Shaker Base Plate: 77-79 Trans Am 400 V8 enginesThis for the 77 79 Pontiac Trans Am with the Real Pontiac 400 V8 .. its the underside of the fibreglass shaker. It clamps onto the top ring of the specific air filter housing. You would buy this if replacing the lid .. OR changing from another engine brand back to a Pontiac. Pontiac is different to Olds or Chev SB in this shaker base plate due to offsets and extended depths of underside wall support that positions the fibreglass shaker to a central
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