Build Z3410
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This photo shows the manifold bolt holes in a Vortec head. Notice that the bolt holes are drilled and threaded at an angle to the mating surface. These holes must be redrilled and threaded before a stock cast-iron manifold can be used. This is often necessary because car and truck engines with Vortec heads were nearly always angle-drilled for fuel injection rather than the carbureted manifold required in many classes. View Related Article
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