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These 1979-93 Mustang phenolic intake manifold spacer kits reduce upper plenum temperatures and help increase horsepower by allowing cooler air intake temperatures. Available for a variety of intake manifolds, such as those from Trickflow, Ford Racing, BBK and even the stock manifold. These 1979-93 Mustang phenolic manifold spacer kits come complete with new gaskets and longer bolts to allow easy installation. These phenolic spacers are also an easy way to increase clearance between intake manifold and tall valve covers.