... continued

and finally the feature listed above, wet vs dry intake manifold

* H75: dry manifold, with no water passages in the cylinder head manifold face
* H89: wet manifold, with small water passage below intake ports

Wet design allows use of disconnected exhaust manifold. Carb hot spot provided by water temp, instead of by exhaust gas hitting the bottom of the intake. Either system works but it means the intake manifold is different, and needs a matching exhaust manifold

H75 manifold face. No water passages (for dry-type manifold)

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  H89 port face - regular size ovals port & small water passages.jpg (64.28 KB)