Genuine Mercury Mercruiser Big Block Manifolds Part number 866178T01 

These Manifolds suit a 496 (8.1 litre) Mercruiser big block – Part number 866178T01 – Retail for $824.62 

BrandGenuine Mercury MerCruiser

MPN866178T01

Suitable Engine496 CID

MerCruiser 496 mag and mag HO Exhaust manifold 866178T01

Fits MCM/MIE 496 MAG & 8.1S engines. Without water rail. 

Part fits port or starboard.

This is cast iron manifold replaces aluminum manifold part 863127T1