MERCRUISER EXHAUST MANIFOLD GM BIG BLOCK (CAST IRON) [51240]

Product Description
In the V8 GM Big Block, GLM's fully tuned 
design guides exhaust gases directly to 
the riser without turbulance and back pressure.
This increases the engine's performance.
These GLM manifolds also feature an additional 30%
increase in water cooling area that decreases the 
manifold's overall body temperature significantly.

*All manifolds are powdercoated black for maximum corrosion protection*

**Cast Iron manifolds come with a 3 year warranty**

Product Information 
Manufacturer: GLM Products, Inc. 
Mercury Part Number: 807078Q07 
OSCO Part Number: 9011A