As one of the most affordable bolt-on parts for today's automotive enthusiasts, Phenolic manifold spacer kits have proven to be a great way to increase performance. CNC machined from a custom phenolic fiber material, these spacer kits increase power by dramatically reducing the transfer of heat from the lower to upper intake manifold. This in turn produces lower inlet air temperatures which results in added horsepower and the ability to add more timing advance with less detonation. Phenolic manifold spacers have also become a popular way of increasing manifold to valve cover clearance to accommodate popular bolt-on such as performance rocker arms and rocker arm covers.
