Professional Products Intake Manifolds from RPM Machine

Proffesional Products
Intake Manifolds

SB Chevrolet
BB Chevrolet
Ford
Pontiac
Honda/Acura

Features of Professional Products Manifolds

Dual Distributor Hold Downs
Sometimes the standard single distributor holddown is difficult to access. So we have provided dual distributor holddowns on all Power+Plus Chevy intake manifolds, which gives you an optional position. And on our 52030 and 52031 Racing Manifold, you can use two holddowns for extra protection against distributor rotation.

Carburetor Adapter Plate
Many Chevy manifolds accept the stock Rochester Quadra-Jet spread-bore carb. But if you want to use one of the popular Holley or Edelbrock square bore carbs, you have to spend more bucks for a carb adapter plate. Power+Plus manifolds with spread- bore patterns include steel adapter plates and gaskets to accept square bore carbs. Included with manifold.

Notrous Bosses
If you want to run nitrous with the injectors mounted directly in the ports, Power+Plus Manifolds provide a simple solution. Many of our manifolds include cast-in nitrous bosses which provide the extra thickness not found in most competitive manifolds without spending a lot more money. This extra thickness is necessary to provide the proper amount of thread engagement All you have to do is drill and tap the bosses to accept any manufacturer's nitrous injectors.

Four Corner Water Ports
All of our performance manifolds feature two extra water ports at the rear of the manifold, a feature normally only found in manifolds costing hundreds more. Some enthusiasts have found that plumbing a line between these two rear ports can reduce engine overheating. Many racers also find these ports to be an advantageous special feature for plumbing special additional water lines.

Water Divider Baffle
The Power+Plus #52030/52031 Manifold is designed for both racing and street applications. It has all the necessary bosses and tapped holes to accommodate street accessories yet it also includes every feature found in manifolds costing hundreds more. One trick feature is the Water Divider Baffle. Expensive race manifolds have this baffle cast in place in the manifold but this precludes the use of a thermostat if you want to use one. The Power+Plus Manifold is machined for a thermostat but the package also includes a drop-in Water Divider Baffle for those who desire this feature.

Special Manifold Adapters
All Power+Plus Street and High Performance Street Manifolds for small block Chevys come with special adapters that allow these manifolds to fit the '87-'95 cast iron heads. If you have '86 or earlier heads, or '87-'95 aluminum heads, our manifolds bolt right on without the adapters. For '87-'95 cast iron heads, drop the adapters in the four slotted holes and bolt up the manifold with no fuss and no special tools required.

Selecting The Correct Manifold for your Application

Cyclone (Idle to 5,500 rpm)

The Professional Products Power+Plus Cyclone manifolds are low rise, dual plane models. These are excellent street manifolds and will provide increased power and torque over a wide rpm range, typically from idle to 5,500 rpm. They also feature excellent throttle response. These manifolds are available in both non-EGR and EGR* versions and the Cyclone models are street legal when used with the correct carburetor and application. See catalog. Models available for SB and BB Chevy.

Crosswind (1,500-6,500 rpm)

The CrossWind models are all based on basic Typhoon designs and offer all the same benefits and design features found in similar CrossWind models. However the CrossWinds feature a lowered valley cover with an open area under the plenum that allows a free flow of air and also isolates the hot oil chamber from the plenum. This creates a cooling effect on the intake charge which provides additional power and torque in the 1,500 to 6,500 rpm range. Models for SB Ford, SB Chevy, and SB Chrysler.

Typhoon (1,500-6,500 rpm)

The Power+Plus Typhoon manifolds are a high rise dual plane intake. These manifolds typically perform best in the 1,500 to 6,500 rpm range and also have excellent throttle response. These manifolds have larger plenums and runners which match the higher lift cams and free flowing exhaust found on many high performance street machines. Not intended for emission equipped engines. Models for SB Ford and Chevy.

Hurricane (3,500-8,500 rpm)

These are single plane, high rise manifolds designed for all out racing applications. Our small block Hurricane has been proven in dyno tests to be the best overall performing manifold of this type. Models currently available for small block Chevy (both standard 23° heads as well as Vortec), small block Ford and big block Chevy. The Hurricane is one of the best performing manifolds of this type.

What Makes Proffesional Products Manifolds Different

Street Molds

All of our manifolds are cast of aluminum in heat treated steel molds, not sand. This type of tooling is over three times as expensive as conventional sand casting tools as used by all other performance manifold companies. But permanent molds produce a far superior part with a smoother finish and less porosity.

Show Polished Finish

We offer a premium hand polished finish at a price that is dramatically less than other polished manifold prices.

Dead Accurate Port Polishing

Permanent molds provide dead accurate port positioning. We do not need to make our ports and runners undersized to allow for core shift. There is no core shift with permanent molds tooling. Power+Plus has extremely accurate port positioning.

Outstanding Performance

Due to the fact that our ports are typically larger than those found in competitive manifolds, our manifolds usually produce more power and torque than others. In fact, in head to head dyno tests with every other similar single plane manifold for small block Chevy, our 52030/52031 manifold outperformed every other manifold

100% Pressure Tested

Every manifold we make is 100% pressure tested. That means the water jackets are pressure tested for leaks, the plenum and port runners are tested for leaks, and the exhaust gas crossover (when utilized) is tested for leaks. This is an extremely time consuming process which is why it is not used by other manifold manufacturers. We find any leaks before the manifold is sold to eliminate installation hassles for you. Do the installation once and do it right.

Bonus Features

Every model Power+Plus Manifold offers features and benefits not found on competing manifolds. And all of this comes at a lower price than any equivalent manifold. Check the Professional Products catalog for detailed information on these extra features.