IMCO Marine

Powerflow Big Block Chevy Manifolds Only Kit , Polished(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 polished. Features an external fitting to accept stock MerCruiser thermostat plumbing. Kit includes gaskets and bolts. 

Powerflow Big Block Kit with Stainless Riser

This "A" pipe is used with Bravo drives or King Cobra drives. It's short design allows for thru transom exhaust tip hook-up. This system has a 10% horsepower increase and 40-50 foot pounds of torque on stock engines. All Powerflow systems are available fully polished.

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.

PowerFlow Big Block Manifold Kit Recirc Polished (Sold in pairs)

PowerFlow Big Block Manifold Kit Recirc Polished (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.

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 are perfect for those who like to pre-heat their motors to get temperature, or for those who have closed cooling systems.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Recirc Manifolds (Polished)	02-1095
2	PowerFlow Big Block Bolt Kits	02-8084
2	Big Block Manifold Gaskets	11-1008
2	Big Block Manifold Riser Gaskets	11-1004

PowerFlow Big Block Manifold Polished and "A" Riser Kit
To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Manifold Polished and "A" Riser Kit

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 Stainless steel "A" risers are designed for stock Mercruiser Bravo exhaust tip locations. 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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	Standard Height "A" Risers	02-6096
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

PowerFlow Big Block Manifold and "A" Riser Kit 3" Taller (Sold in pairs) )
To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Manifold and "A" Riser Kit 3" Taller

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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	3" Taller "A" Risers	02-6097
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

PowerFlow Big Block Polished Manifold and "A" Riser Kit 6" Taller (Sold in pairs)
To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Polished Manifold and "A" Riser Kit 6" Taller

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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	6" Taller "A" Risers	02-6096
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

 

PowerFlow Big Block Polished Manifold and "SA" Riser Kit

To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Polished Manifold and "SA" Riser Kit

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.

SA riser pipes are designed for Mercruiser Silent Choice, Corsa Quick and Quiet, and IMCO's Sound Advantage systems. A 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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	Standard Height "SA" Risers	02-6108
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

PowerFlow Big Block Polished Manifold and "SA" Riser Kit 3" Taller (Sold in pairs)
To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Polished Manifold and "SA" Riser Kit 3" Taller

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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	3" Taller "SA" Risers	02-6109
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

PowerFlow Big Block Polished Manifold and "SA" Riser Kit 6" Taller (Sold in pairs)
To view and download the PDF line drawing Left Side  CLICK HERE
To view and download the PDF line drawing Right Side  CLICK HERE
To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Big Block Polished Manifold and "SA" Riser Kit 6" Taller

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.

	Kit Includes
QTY	Description	P/N
2	PowerFlow Big Block Manifolds (Polished)	02-1092
2	6" Taller "SA" Risers	02-6110
2	PowerFlow Big Block Bolt Kits	02-8083
2	Big Block Manifold Gaskets	11-1008

Powerflow Big Block System with Stainless Silent Choice Risers

This popular system allows the use of a switchable exhaust diverter. These risers are stainless steel and custom designed to ease installation. They use a standard 4" diverter connection.

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.

Black PowerFlow Plus 30-deg Risers

Black PowerFlow Plus 30-deg Riser (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 33" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.

Polished PowerFlow Plus 30-deg Risers

Polished PowerFlow Plus 30-deg Riser (shown with PowerFlow Plus Manifold) (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 33" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with 2 1⁄4" primaries, they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We offer several internal mufflers for you to choose. Please call IMCO for further information.

Black PowerFlow Plus 85-deg Risers

Black PowerFlow Plus 85-deg Riser (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 33" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.

Polished PowerFlow Plus 85-deg Risers

Polished PowerFlow Plus 85-deg Riser (Shown with PowerFlow Plus Manifold) (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 33" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.

Black PowerFlow Plus 90-deg Risers

Black PowerFlow Plus 90-deg Riser (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 15" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.

Polished PowerFlow Plus 90-deg Risers

Polished PowerFlow Plus 90-deg Riser (Shown with PowerFlow Plus Manifolds) (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 15" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.

PowerFlow Plus Manifold and 30° Riser Kit Black

To view and download the PDF line drawing  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Plus Manifold and 30° Riser Kit Black

IMCO's innovative patented cast aluminum manifolds and risers are designed with internal runners for 510 cubic inch, naturally aspirated, or blown big block Chevy engines. Fully water-jacketed with 2 1/4" primaries, they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs headers in torque, rpm, horsepower, and most of all longevity. Black manifolds and riser are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pies are custom made to your exact specifications. We off several internal mufflers for you to choose.

 

	Kit Includes
QTY	Description	P/N
2	PowerFlow Plus Manifolds (Black)	02-1161
2	PowerFlow Plus Risers 30° (Black)	02-1163
2	PowerFlow Plus Manifold Bolt & Gasket Kits	02-8085
2	PowerFlow Plus Riser Pipe Bolt & Gasket Kits	02-8087
2	Big Block Manifold Gaskets	11-1008

PowerFlow Plus Manifold and 30° Riser Kit Polished

To view and download the PDF line drawing  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Plus Manifold and 30° Riser Kit Polished

IMCO's innovative patented cast aluminum manifolds and risers are designed with internal runners for 510 cubic inch, naturally aspirated, or blown big block Chevy engines. Fully water-jacketed with 2 1/4" primaries, they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs headers in torque, rpm, horsepower, and most of all longevity. All stainless steel tail pies are custom made to your exact specifications. We off several internal mufflers for you to choose.

 

	Kit Includes
QTY	Description	P/N
2	PowerFlow Plus Manifolds (Polished)	02-1162
2	PowerFlow Plus Risers 30° (Polished)	02-1164
2	PowerFlow Plus Manifold Bolt & Gasket Kits	02-8085
2	PowerFlow Plus Riser Pipe Bolt & Gasket Kits	02-8087
2	Big Block Manifold Gaskets	11-1008

PowerFlow Plus Manifold & 85° Riser Kit Black

To view and download the PDF line drawing  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Plus Manifold & 85° Riser Kit Black

IMCO's innovative patented cast aluminum manifolds and risers are designed with internal runners for 510 cubic inch, naturally aspirated, or blown big block Chevy engines. Fully water-jacketed with 2 1/4" primaries, they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs headers in torque, rpm, horsepower, and most of all longevity. Black manifolds and riser are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pies are custom made to your exact specifications. We off several internal mufflers for you to choose.

 

	Kit Includes
QTY	Description	P/N
2	PowerFlow Plus Manifolds (Black)	02-1161
2	PowerFlow Plus Risers 85° (Black)	02-1165
2	PowerFlow Plus Manifold Bolt & Gasket Kits	02-8085
2	PowerFlow Plus Riser Pipe Bolt & Gasket Kits	02-8087
2	Big Block Manifold Gaskets	11-1008

PowerFlow Plus Manifold and 90° Riser Kit Black

To view and download the PDF line drawing  CLICK HERE

To view and download the PDF water hose diagram  CLICK HERE

PowerFlow Plus Manifold and 90° Riser Kit Black

IMCO's innovative patented cast aluminum manifolds and risers are designed with internal runners for 510 cubic inch, naturally aspirated, or blown big block Chevy engines. Fully water-jacketed with 2 1/4" primaries, they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs headers in torque, rpm, horsepower, and most of all longevity. Black manifolds and riser are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pies are custom made to your exact specifications. We off several internal mufflers for you to choose.

 

	Kit Includes
QTY	Description	P/N
2	PowerFlow Plus Manifolds (Black)	02-1161
2	PowerFlow Plus Risers 90° (Black)	02-1167
2	PowerFlow Plus Manifold Bolt & Gasket Kits	02-8085
2	PowerFlow Plus Riser Pipe Bolt & Gasket Kits	02-8087
2	Big Block Manifold Gaskets	11-1008