IMCO Marine

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

Shown with optional riser bung. These manifolds were designed for high horsepower 350 cid to 427 cid engines that are making 350 HP Plus. Manifolds have a 1 1/2" I.D. runner with a tall D port entry. The outlet is 3" with a stainless steel air straightened plate to direct exhaust into riser pipe for maximum scavenging. Manifolds will work with angled spark plugged heads or straight spark plugged heads. Also you can use tall valve covers for various rocker arm assemblies and stud girdle.

Weight savings of 65 lbs over cast iron and allows for twin installation down to 30" centers.

Small 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.

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 Small 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.

Powerflow S-Pipe System - Big Block System Chevy with Stainless Risers

This "S" pipe is unique in many ways. It has an infinite number of advantages. This pipe will size up to many pre-existing port locations. It's great for below platform applications with large camshafts or high performance motors. It allows the exhaust to mix with water down at the first 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.

Powerflow S-Pipe System - Big Block System Chevy with Stainless Risers and Polished Manifolds

This "S" pipe is unique in many ways. It has an infinite number of advantages. This pipe will size up to many pre-existing port locations. It's great for below platform applications with large camshafts or high performance motors. It allows the exhaust to mix with water down at the first 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.

Powerflow S-Pipe System - Small Block System Chevy with Stainless Risers

This "S" pipe is unique in many ways. It has an infinite number of advantages. This pipe will size up to many pre-existing port locations. It's great for below platform applications with large camshafts or high performance motors. It allows the exhaust to mix with water down at the first 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.

Prop & Pinion Gear 1:25

Prop & Pinion Gear 1:34

Prop & Pinion Gear 1:50

Prop Adaptor (1 7/16" Prop Shaft)

Designed to fit IMCO 1 7/16" prop shaft and Mercury style square bore prop hubs

Prop Adaptor Ring

Prop Gear (1:25) 19 Tooth

Prop Gear (1:34) 17 Tooth

Prop Gear (1:50) 19 Tooth

Tank Only

This system helps eliminate the problem of oil blowing out of the breathers onto the valve covers. The tank measures 3-1/2" in diameter and is 11" long with 1" NPT at each end and a 1/8" NPT drain plug.

Puke Tank Hose and Fitting Kit

We've made the task of sorting out the right fittings and hose for hooking up your puke tank an easy job.

This kit contains:
• (4) feet of -12 AN Hose
• (2) -16 AN to -12 AN Adapters for Breather Fittings
• (2) -12 AN to 1" NPT Adapters for Puke Tank Fittings
• (4) -12 AN Push On Hose Fittings .

Pump Cap Assembly w/-8 JIC Adapter Black Anodized 6061-T6 Aluminum

Quad Ring (Cooling Water, Bottom)

Quad Ring (Cooling Water, Top)