The above photo shows a standard Holbay manifold as fitted to the Hunter gls/Rapier h120. AS it was fitted at a 7 degree angle it needs to be machined flat, this would leave 1 side thin so prior to machining it has been built up with weld. Next its been clamped to the bed of a vertical milling machine & milled flat with a fly cutter to minimise distortion through heat.
Using the inlet manifold gasket as a guide all ports were enlarged to suit & polished to improve air flow
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