Precision Works Intake Manifold Adapter K2H K-Series to H-SeriesPrecision Works Intake Manifold Adapter K2H K Series to H Series H2K Installing a K Series intake manifold onto a H Series engines? This is the adapter you need! Also known as K2H or H2K adapter. K Series intake manifolds have shorter runners and larger plenums when compares to H Series intake manifolds. There's also many more aftermarket performance K Series manifolds that are available on the market. Intake manifold adapter flange Fits K Series