Importance

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Abstract

Disclosed herein is a multi-piece cylinder head lost foam pattern assembly comprising a first piece having a planar valve seat surface extending at an angle other than 90.degree. degrees to the axis of the associated cylinder, a glue surface extending in spaced and parallel relation to the valve seat surface on the opposite side thereof from the associated cylinder, and a first fluid flow passage portion extending between the valve seat surface and the glue surface, and a second piece having a first glue surface engaging the glue surface of the first piece, a second glue surface extending in spaced and parallel relation to the first glue surface of the second piece, a second fluid flow passage portion extending between the first and second glue surfaces of the second piece, and registering with the first fluid flow passage portion in the first piece, and a recess formed in the second glue surface and communicating with the second fluid flow passage portion, and a third piece having a first glue surface engaging the second glue surface of the second piece and including therein a recess mating with the recess in the second glue surface of the second piece and forming, with the recess in the second piece, a third fluid flow passage portion communicating with the second fluid flow passage portion.

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First Claim