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Holley EFI Low Profile 351W Dual Sync Distributor - 565-111 lug-nuts-and-bolts Application 59-61 Chevy Bel AirOverview: Specifically designed for use with the Holley 351w Hi Ram intake manifold, this compact unit shares all of the same great features of our other Holley EFI Dual Sync distributors. The design includes dual Hall Effect sensors for the crankshaft and camshaft signals. It can be used as just a crank speed input, as well as providing a cam sync signal for sequential fueling operation. It is also perfect providing the needed crank and cam signals