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The upper intake manifold plenum box gasket is stainless-steel reinforced and provided a perfect fit. The upper plenum box is secured with 1/4″ x 20 x 3/4″ stainless socket head cap screws. I applied a dab of moly to the threads prior to installation. I tightened all screws to 60 in-lbs using a criss-cross pattern. [...]