Mercruiser Thermostat Housing→GM Big Block V8 with Log Style Manifolds

Part # & Price	Description
BARMC-29-78985 $163.95	Housing Thermostat Lower Mercruiser GM 454 7.4L, 502 8.2L V8 Log Style Thermostat Base for Mercruiser GM big block V8 with log style or end style manifolds manifolds. This was typically used before 1983 and works with this style exhaust system:
BARMC-29-47442 $38.95	Housing Thermostat Cover Mercruiser GM 454 7.4L 502 8.2L V8 47442 Thermostat Cover Housing for Mercruiser GM 454 cid 7.4L and 502 cid 8.2L big block V8. Notice the offset holes. The models that have an aluminum intake manifold normally had the holes straight across from each other therefore they would use a small block housing. Replaces: Mercury Marine Quicksilver original equipment part # 47442