Moroso's unique wood design spacersare precision machined on millworking centers so they are precise enough to be used individually or stacked without the use of gaskets. Thin layers of choice laminated hardwood, bonded together with resin form a natural heat sink that keeps your carb cool and fuel charge dense. Top-quality hardwood has a sheet of phenolic resin-impregnated paper bonded to both sides. These spacers can be easily modified to your particular manifold for optimum performance.