MerCruiser V8 325/330/350 Lower Thermostat Housing 

Lower thermostat housing.

Replaces MerCruiser 78985A1 and Osco MC553-BB.

Fits MerCruiser V8 325, 330, 350, 370 and 400, inboard and stern drive units (log style direct replacement).

Compatible parts:

• MC-1-47735 direct replacement water cooled exhaust manifold (port side).
• MC-1-47736 direct replacement water cooled exhaust manifold (starboard side).
• MC-20-72963 direct replacement exhaust elbow riser.
• MC-20-76668 direct replacement exhaust elbow riser.
• MC-20-61811A4 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.

Manufactured by Barr Marine. Part number MC-29-78985.