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GLM is proud to introduce our Marine Manifolds & Elbow/Risers!
GLM Manifolds are Superior in the Aftermarket Marine Parts Industry.
Designed to Increase Performance, Reduce Back Pressure
and Add More Horsepower to Your Engine!
Cast Iron Manifolds are Black Painted and Aluminum Manifolds
are Black Powdercoated for Corrosion Resistance!
The Only Manifold in the Aftermarket Manufactured
using the "Lost Foam" Casting Process!
-More Rigid, Less Chance of Failure.
 -Excellent Dimensional Tolerances.
-No Structural Limitations for Casting.
-More Durable and Reliable than
other types of Cast-Iron Technology.
-Greater Control over the Accuracy of the Wall Thickness
Preventing Thin Spots that can Corrode Through Prematurely.
DRY JOINT REPLACEMENT ELBOW / RISER for V6 & V8 S.B.
 
GLM No. 51148 has two extra water ports
on each side and a larger bottom port.
This allows for maximum water flow
through the
riser, significantly reducing
the chance of blockage. Purchasing our
manifold/elbow set
replaces both pieces,
eliminating your dry joint system!
ELBOWS / RISERS
 
In the MerCruiser 4" Riser, there are two
extra exits at each side. This allows water
to exit more efficiently, keeping engine cooler.
SMALL BLOCK
 
Our fully tuned design guides exhaust gases directly to riser without turbulence and back pressure. This increases
the engines performace up to 10%. In the meantime, an additional 40% water cooling area will decrease the entire manifold
body temperature significantly.
BIG BLOCK
 
Our fully tuned design will reduce turbulence and enhance flow for added performance. An extra 30% water cooling
area will help reduce temperature in the exhaust exit area allowing for longer gasket life.
GLM Manifolds and Elbow/Risers are Available in Cast Iron and Aluminum.
 
GLM now offers a V6 (No. 58650) and a
V8 S.B. (No. 58660) Manifold/Elbow Set
to replace your Dry Joint Exhaust System:
- One Manifold
- One Elbow/Riser
- All Gaskets and Hardware!
 
GLM also offers 100% Complete Sets
& 100% Complete Conversion Kits:
- Two Manifolds
- Two Elbow/Risers
- All Gaskets and Hardware!
Click the Image Below to Download GLM's Manifold Catalog!
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