In order to install the natural gas injectors, holes must be drilled in the intake manifold. To be cautious not to get aluminum metal shavings inside the cylinders, I chose to pull the manifold from the block.
Once the hole locations were identified, the manifold was pulled and the holes for the nipples were drilled and tapped. See picture of hole locations.
Once the nipple holes were drilled, the holes were tapped to match the nipple threads. The nipples were installed after which the manifold was re-attached to the block and the natural gas valves were added. See photo of natural gas injectors.
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