Freshwater cooling system for OMC V-8 Chevrolet 307cu in 215/225hp marine engine Kit includes: heat exchanger, mounts, gaskets, thermostat, thermostat housing, hoses, hose clamps, hose fittings, & fasteners 1973 & older 2 pass manifolds Each manifold has two 5/8 hose spuds on the manifolds When connecting the raw water, be sure you pick up both outlets w/ the F fitting. One fitting will cause heating problems Cools block only

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