IMCO Marine

Pinion Hub (5/16" Copper Sealing Washers)

10 per Upper Case Assembly (Sold Each)

Pinion Hub (SCX, SCX4, SCXT, SCX4T)

Pinion Hub Shims

Pinion Hub Shims (Packaged as a kit)

Pinion Seal Carrier

Used with XR yoke.

Pinion Seal Carrier

Pinion Shim

Pinion Shoulder Washer

Pinion Shoulder Washer

Pipe Plug - 1/8 NPT S/S

Polished Stringer Mount Bolts to side of Stringer.

Mounts are cast A-356 aluminum heat treated to -T6 full hard for maximum strength. Stringer mounts (SOLD IN PAIRS).

Black big block manifolds. (Sold in pairs)

These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds on big blocks. We have experienced 40 to 50 foot pounds of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

Powerflow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout. Black manifolds are hard anodized prior to powder coat, to ensure against corrosion. All manifolds are available in Recirc or standard.

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations (AS SHOWEN IN RISER PIPE SECTION), to accommodate just about every application. Custom riser pipes can also be manufactured to order, just give us a call for details.

Our Powerflow manifolds have a weight savings of 80 pounds over stock cast iron big block manifolds. It allows for twin engine mounting down to 33" centers.

Polished big block manifolds. (Sold in pairs)

These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds on big blocks. We have experienced 40 to 50 foot pounds of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

Powerflow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout. Black manifolds are hard anodized prior to powder coat, to ensure against corrosion. All manifolds are available in Recirc or standard.

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations (AS SHOWEN IN RISER PIPE SECTION), to accommodate just about every application. Custom riser pipes can also be manufactured to order, just give us a call for details.

Our Powerflow manifolds have a weight savings of 80 pounds over stock cast iron big block manifolds. It allows for twin engine mounting down to 33" centers.

These Powerflow Recirc or Preheat Manifolds are a specialized exhaust system that are one of many examples for all out powerboat racing applications. (Sold in pairs)

These are perfect for those who like to pre-heat their motors to get temperature, or for those who have closed cooling systems (early style, round hole with round water inlet replacement manifolds available).

These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds on both small block and big block. We have experienced 40 to 50 foot pounds of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

Powerflow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout. Black manifolds are hard anodized prior to powder coat, to ensure against corrosion. All manifolds are available in Recirc or standard.

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations (AS SHOWEN IN THE RISER PIPE SECTION), to accommodate just about every application. Custom riser pipes can also be manufactured to order, just give us a call for details.

Our Powerflow manifolds have a weight savings of 80 pounds over stock cast iron big block manifolds. It allows for twin engine mounting down to 33" centers.

Polished big block recirculation manifolds. (Sold in pairs)

These Powerflow Recirc or Preheat Manifolds are a specialized exhaust system that are one of many examples for all out powerboat racing applications.

These are perfect for those who like to pre-heat their motors to get temperature, or for those who have closed cooling systems (early style, round hole with round water inlet replacement manifolds available).

These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds on both small block and big block. We have experienced 40 to 50 foot pounds of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

Powerflow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout. Black manifolds are hard anodized prior to powder coat, to ensure against corrosion. All manifolds are available in Recirc or standard.

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations (AS SHOWEN IN THE RISER PIPE SECTION), to accommodate just about every application. Custom riser pipes can also be manufactured to order, just give us a call for details.

Our Powerflow manifolds have a weight savings of 80 pounds over stock cast iron big block manifolds. It allows for twin engine mounting down to 33" centers.

Shown with optional riser bung. These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds. We have experienced 40-50 foot pound of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

PowerFlow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout.

Big Block 3" Stainless steel "A" risers are designed for stock Mercruiser Bravo exhaust with 3" riser block between manifold & Riser. tip locations should be 3" higher then stock. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG).

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations to accommodate just about every application. Custom riser pipes can also be manufactured to order, see "custom pipes" for details.

Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers. To order see PowerFlow accessories or click on "Related Products" on the right side of screen.

These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds. We have experienced 40-50 foot pound of torque on bigh block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

PowerFlow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout.

Big Block 6" Stainless steel "SA" riser pipes are designed to replace stock Mercruiser Bravo exhaust with 6" riser block between manifold & Riser. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG).

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations to accommodate just about every application. Custom riser pipes can also be manufactured to order, see "custom pipes" for details.

Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers. To order see PowerFlow accessories or click on "Related Products" on the right side of screen.

Shown with optional riser bung. These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds. We have experienced 40-50 foot pound of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

PowerFlow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout.

Big Block 3" Stainless steel "SA" riser pipes are designed to replace stock Mercruiser Bravo exhaust with 3" riser block between manifold & riser. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG). Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers. To order see PowerFlow accessories. They can also be used with our Aluminum "S" pipes part number 02-1225 for under swim step applications.

The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations to accommodate just about every application. Custom riser pipes can also be manufactured to order, see "custom pipes" for details.

Shown with optional riser bung. These high performance manifolds are unique in design, that creates a high velocity airflow that increases torque, rpm, and horsepower over stock cast iron manifolds. We have experienced 40-50 foot pound of torque on big block 502, 415 horsepower motors, and 80 to 90 foot pounds of torque on engines up to 575 cubic inches.

PowerFlow manifolds are water-jacketed, water surrounds each exhaust passage, including the ports to eliminate burnout.

Big Block 6" Stainless steel "SA" riser pipes are designed to replace stock Mercruiser Bravo exhaust with 6" riser block between manifold & riser. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG). Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers.To order see PowerFlow accessories. They can also be used with our Aluminum "S" pipes part number 02-1225 for under swim step applications. The risers are highly polished stainless steel, and are designed for 4" exhaust tips. We offer a wide variety of riser pipe configurations to accommodate just about every application. Custom riser pipes can also be manufactured to order, see "custom pipes" for details.

Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers. To order see PowerFlow accessories or click on "Related Products" on the right side of screen.

Powerflow Big Block Chevy Manifolds Only Kit (Pair of Manifolds)

Powerflow manifolds are manufactured using the finest materials and most advanced techniques available. The high quality aluminum manifold castings feature water jackets that surround each exhaust passage, including the port, to eliminate the possibility of burn out.

 The outside manifold surfaces are then coated with the highest quality epoxy powder coating available, creating a part that not only is highly corrosion resistant, but good looking as well. Features an external fitting to accept stock MerCruiser thermostat plumbing. Kit includes gaskets and bolts.