Manifold Swapping for Roots Blower - 134 HP With One Bolt-On!
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The 750 HP also had a boost-referenced power valve that the 650 did not. Boost referencing allows the power valve to open the enrichment circuit even though there is still a vacuum signal under the carb trying to hold it closed. By plugging the vacuum port on the baseplate and drilling a hole into the vacuum chamber that operates the power valve, this modification allows a vacuum hose to be run to the manifold under the blower where a zero-vacuum signal will allow the power valve to open at signals below the valve's rating. View Related Article
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