Reply to "Mysterious ‘China-wall’ gap"

Larry

The extra width of the CHI head will be immediately obvious. Notice in the picture how the manifold face of the factory cylinder head is right at the corner formed by the valley rail and the cylinder head deck. The manifold face of the CHI heads will stick-out beyond that corner. The spacers CHI once sold had wedge shaped ends that would allow the spacers to fit under the heads, necessary because of the way in which the heads stick-out over the valley rails.