GLM Products Inc - Superior Marine Manifolds
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Superior Marine Manifolds

GLM is proud to introduce our Marine Manifolds & Elbows!

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
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 Casting Technology.
-Greater Control over the Accuracy of the Wall Thickness
Preventing Thin Spots that can Corrode Through Prematurely.


HI-RISE ELBOWS for OMC & VOLVO PENTA V6 / V8 S.B. / V8 B.B. & V8 FORD

GLM No. 51336, 51337 & 51338 are direct
replacements for the OMC and Volvo Penta
Hi-rise elbows. GLM No. 51336 replaces
OEM No. 3889964 for Volvo Penta V6 2007
& up (complete kit No. 58486). GLM No.
51338 replaces OEM No. 3889965 for
Volvo Penta V8 S.B. 2007 & up (complete
kit No. 58438). GLM No. 51337 replaces
OEM No. 3862627 for OMC & Volvo Penta
V6, V8 S.B., V8 B.B and V8 Ford 1991 & up
(complete kits No. 58487, 58437, 58507 &
58492). GLM also offers the standard riser
No. 51330 to replace OEM No. 3857944.


DRY JOINT ALTERNATIVE 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.


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!


TECH ARTICLES Related to MANIFOLDS:
The Evolution of a Dream: GLM's Conversion Kits
  GLM Products, Inc. takes things a few fathoms deeper. While most aftermarket marine parts manufacturers outsource their design and production, GLM's specialty is...
By GLM Technician, Ed Garcia

>> read more
Superior Manifolds: High Quality, Cost-Effective Aftermarket Marine Parts
  To some observers, the aftermarket parts business may seem rather repetitive. After all, it's already been done, right? In many industries this may be true, but GLM Products, Inc. has redefined the meaning...
By GLM Technician, Ed Garcia

>> read more
Lost Foam: A New Wave of Sand Casting Swells in the Marine Industry
  With the growing demand for high quality aftermarket marine products, new technological advances have impacted the marine industry in a huge and significant way. While one sand casting...
By GLM Staff, Michael Pike

>> read more
Click the Images Below for Manifold Related Links:
Click Here for 4-Cylinder Manifolds & Elbows/Risers.
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