GLM's Cast Iron Wet Joint & Dry Joint Marine Manifolds & Elbows

GLM is the Leader of 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!

COOLER RUNNING ELBOWS / RISERS

In the MerCruiser 4" Riser, there are two
extra ports at each side. This allows water
to exit more efficiently, keeping engine cooler.

FULLY TUNED SMALL BLOCK MANIFOLD

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.

FULLY TUNED BIG BLOCK MANIFOLD

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.

WET JOINT MANIFOLDS / ELBOWS (1983-2002) - INTERNAL COOLING EXHAUST SYSTEM

From 1983 to 2002 MerCruiser used an internal method of transferring water from the manifolds to the elbow. This is called the "Wet Joint" exhaust system. In this system the water jackets are casted directly into the elbow..

DRY JOINT MANIFOLDS / ELBOWS (2002-2010) - EXTERNAL COOLING EXHAUST SYSTEM

In 2002 MerCruiser improved the method of transferring water from the manifold to the elbow. This is called the "Dry Joint" exhaust system. This system uses external water passages to stop any leakage inside the exhaust ports due to corrosion or blocked passages.

DRY JOINT ALTERNATIVE - A WET JOINT REPLACEMENT OF YOUR DRY JOINT SYSTEM

GLM has removed the external water ports and cast water jackets directly into the elbows & manifolds, replacing the "Dry Joint" system with the standard "Wet Joint" system. GLM has also added two extra water ports and a larger bottom port for elbow No. 51148. This allows for maximum water flow through the riser, reducing the chance of blockage.

COMPLETE MANIFOLD KITS - WET JOINT & DRY JOINT - 4-CYL / V6 / V8 / V8 FORD

GLM manufactures replacement "Wet Joint" manifolds/elbows for the following major brands: MerCruiser (4-Cylinder, V6, V8); OMC / Volvo Penta (4-Cylinder, V6, V8, Ford V8) & Barr (V8, Ford V8). GLM manufactures replacement "Dry Joint" manifolds/elbows for MerCruiser (V6 & V8 S.B.) with both 7 degree and 10 degree down angle elbows/risers.

Complete Manifold Kits Include:
- Two Exhaust Manifolds
- Two Exhaust Elbow/Risers
- All Gaskets and Hardware!

COMPLETE MANIFOLD KITS w/ HI-RISE ELBOWS OMC/VOLVO PENTA - V6 / V8 / V8 FORD

GLM manufactures replacement Hi-Rise "Single-Piece" elbows/risers for OMC & Volvo Penta (V6, V8, V8 Ford). These complete kits include either the 11.3" high elbows or the 10.3" high elbows. The 11.3" elbows replace OMC & Volvo Penta V6, V8, Ford V8 w/ carburetor engine (1991 & Up). The 10.3" elbows replace Volvo Penta V6, V8 (2007 & Up).

Complete Hi-Rise Manifold Kits Include:
- Two Exhaust Manifolds
- Two Exhaust Hi-Rise Elbow/Risers
- All Gaskets and Hardware!

COMPLETE MANIFOLD CONVERSION KITS - V6 / V8 / V8 FORD / 460 ADAPTER PLATE KITS

GLM manufactures Conversion Kits for MerCruiser V6, V8 S.B., OMC V6 and OMC Ford V8 S.B. The V6 Conversion Kits convert the "NLA" Single-Piece Manifolds to GLM's Two-Piece Center Rise Manifolds. The V8 S.B. Conversion Kits convert the older, less effecient, "Log Style" Manifolds to GLM's more effecient, Two-Piece Center Rise Manifolds. GLM also manufactures 460 Adapter Plate Kits for Mercruiser, OMC & Volvo Penta V8 B.B. These kits allow you to use GM B.B. manifolds on your Ford 460 Engine.

COMPLETE SPACER KITS for WET JOINT, DRY JOINT & DRY JOINT ALTERNATIVE

GLM also manufactures replacement Spacer Kits for MerCruiser Wet Joint, Dry Joint and Dry Joint Alternative Manifold/Elbows. Wet Joint Spacer Kits for V6, V8 S.B. and V8 B.B. come in either 3 inch or 6 inch for Standard Cooling. Dry Joint Spacer Kits for V6 and V8 S.B. come in either 1.7 inch or 3 inch for both Standard and Closed Cooling Systems. Dry Joint Alternative Spacer Kits for V6 and V8 S.B. come in 3 inch for Standard Cooling. GLM also offers Complete Manifold Kits with Spacers for MerCruiser Wet Joint and Dry Joint Alternative.

Click the Image Below to Download GLM's Manifold Catalog!