74643 Heat Exchanger. Mercruiser 74643A2 GM (Chevy) 5.0-Liter and 5.7-Liter Small Block Mercruiser Inboard Engines with LOG STYLE (End Exhaust) Manifolds, engines up to 1982 with log style exhaust manifolds.Front mounted over engine circulating water pump, cools engine block and manifolds.
Made with pride by Lenco, in Long Island, NY. Call us with any questions at (631) 842-4049