The 52000/52001 Power+Plus Cyclone Manifold is a direct replacement for the stock manifold on 1957-’95 Small Block Chevy non-EGR engines. Includes special adapter bushings to fit ’87-’95 engines. Use the stock Quadra-Jet carb or 500-650 cfm vacuum secondary carburetor. Kit includes adapter plate to permit use of certain square bore style carburetors. Power+Plus Manifolds are cast from steel molds, not from sand molds. Permanent molds provide a tighter grain casting thereby reducing the occurrence of porosity which can mar the polished finish. Additionally, each Power+Plus Manifold is 100% pressure tested for leaks to eliminate installation problems. This is our most popular manifold and is showing up on many performance street machines and street rods.

50 STATE LEGAL. Note: The 52000/52001 manifold is a stock replacement/street legal part for 302, 327, and 350 V8s with OEM carb or Edelbrock #1400 carb; 1966-72 (1973 non-CA) passenger cars, 1966-83 trucks and Suburbans, except stock equipped EGR. Also stock replacement/street legal for 302, 327 and 350 V8s with 1987-95 heads with OEM 4-bbl carb, except stock equipped EGR. *Will not work on engines w/reverse flow heads as utilized on 1992-96 LT-1 Corvette, 1993-’97 LT-1 Chevy Camaro, Pontiac Firebird, Chevy Caprice, Impala and Buick Roadmaster.

This manifold is based on our most popular manifold, the Performance Street #52000/52001. It is designed to fit engine swaps using the 1996 and later Vortec (Gen 1+) cast iron heads or the Edelbrock E-Tec aluminum heads. These cylinder heads are very popular in street rods, engine swaps, or the industrial market. This manifold can be used on any Chevy V-8 engine utilizing the late Vortec head. This manifold has provision for external water bypass. It also features four corner water outlets, dual distributor holddowns, includes a square bore carb adapter and gasket, and will work with a late model style water neck, alternator, HEI and air conditioning brackets. Will also fit 1996 and later Vortec engines with some minor modifications. The modification is not to the manifold itself. It just requires running a short section of heater hose from the pipe tapped hole in the front of the manifold to the 5/8" hose nipple on passenger's side of the water pump. The 1966 and later Vortec blocks do not have a water bypass in the block and this hose takes care of that issue.

The 52008/52009 (EGR) Power+Plus Cyclone Manifold is a direct replacement for the stock manifold on 1972-’86 GM Small Block Chevys with EGR and 1981-’86 GM Corporate 350 V8 engines with EGR. It is essentially the same design as the 52000/52001 except it incorporates a provision for EGR. This manifold features a dual distributor holddown provision, four corner water ports, adapter plate and gasket for square bore carb, and insert bushings which allow the manifold to fit on 1987-’95 cylinder heads. This manifold is an ideal street manifold and provides street legal operation in the listed applications. Will accept late-model choke, waterneck, air-conditioning, alternator, and H.E.I. ignitions systems. This is a great all around street performance intake manifold.

50 STATE LEGAL. Note: The 52008/52009 manifold is a stock replace- ment/street legal part for 1972-86 305, 350 and 400 V8s with OEM 4-bbl or Edelbrock #1400 carb; and 1981-86 GM corporate 350 V8 engines.

This is our top-of-the-line medium profile street performance manifold. It is similar to our 52000/52001 Cyclone, although slightly taller, but with several important modifications. First, it has a square bore carb flange instead of a spread bore. The square bore flange permits direct bolt-on of all popular Holley, Edelbrock, Carter, and Demon carburetors. This manifold is also the only SB Chevy manifold available that features a built-in rear water crossover passage. This typically will provide for better overall water flow and cooler engine operating temperatures. It also features nitrous bosses, and rear water ports. This manifold is also supplied with a quality intake gasket set, 12-point stainless steel attachment bolts, stainless washers, and a full complement of aluminum pipe plugs to plug unused tapped holes. We even include a tube of Permatex Ultra-Black silicone sealer for use on the two ends of the manifold where it seals to the block. This manifold will typically produce more power than any similar competitive manifold due to larger ports and runners.

Dyno Test Comparison PDF 52031_52025_52010 .PDF

This manifold is essentially the same as the 52010/52011 above except it does not include all the extras such as gaskets, 12-point bolts, etc. This is an outstanding performance street manifold and represents current state-of-the-art technology in intake manifold design for small block Chevy engines using the popular 23° cylinder heads. This manifold features an integral rear water crossover passage. This is the only small block Chevy manifold currently in production with this feature.

NOTE: Manifolds will not work on engines with reverse flow heads as utilized on 1992-'96 LT-1 Corvette or 1993-'97 LT1 Camaro, Firebird, Caprice, Impala or Roadmaster.

The Power+Plus Typhoon Manifold is a high performance dual plane, 180° street manifold designed to be used with Holley, Carter AFB, or Edelbrock square bore carbs. For street applications use 600-700 cfm vacuum secondary carbs. For high performance street, use 700- 800 cfm double pumper carburetors. This manifold produces power comparable to some single plane manifolds yet retains the throttle response and drive ability typical of a dual plane. This manifold also features cast-in nitrous bosses with water outlets at all four corners plus dual distributor holddowns. This manifold is .70-inches taller than the #52000 or #52001. It has a provision to add an oil fill tube. No provision for exhaust heated or stock style chokes. Accepts late model waterneck, A/C, alternator, and HEI. Will fit cast iron bow tie heads and ‘87-’95 cast iron or aluminum heads. Will not fit under a stock Vette hood.

Dyno Test PDF 52020 .PDF

The new CrossWind Manifold is a special version of the 52020/52021. While it is the exact same height, it features an open area under the plenum chamber. This provides for a flow of cooling air which keeps the temperature of the air/fuel charge lower thus producing more power and torque. The interior plenum and port design are identical to the 52020/52021 and will provide somewhat better overall power than the 52020/52021 due to the special air gap style design.

Dyno Test Comparison PDF 52031_52025_52010 .PDF

The Power+Plus CrossWind for the Vortec features the same plenum and runner design as our popular 52020/52021 and 52025/52026 manifolds. In this design the manifold is made wider to accommodate the Vortec design heads and also features the Vortec port configuration. The manifold also has a square bore carb pad to utilize the standard Holley, Carter and Edelbrock carburetors. This manifold is intended for use on up through ‘95 blocks using the 1996 and later Vortec (Gen 1+) heads or Edelbrock E-Tec heads. It can also be used on ‘96 and later Vortec engines with some minor modifications.
The modification is not to the manifold itself. It just requires running a short section of heater hose from the pipe tapped hole in the front of the manifold to the 5/8" hose nipple on passenger's side of the water pump. The 1966 and later Vortec blocks do not have a water bypass in the block and this hose takes care of that issue.

This Hurricane Intake Manifold is available for the standard 23° cylinder heads. This manifold, despite beinig a racing model, has been our number one seller for the past several years. That’s because it is very affordable and also produces more power and torque than competitive models and uses less fuel doing it which means it is a very efficient manifold. We now have an improved model called the Hurricane+Plus but will continue to offer this manifold because it is lower priced and is more than suitable for many racing applications, particularly in claimer type classes where it is important to keep engine costs low. Features include nitrous bosses, dual distributor holddowns, four corner water ports plus a fifth pipe tapped water outlet in the front of the manifold. This manifold, unlike its competitors, will also fit 1987-’95 angle bolt heads.

Dyno Test PDF 52030 .PDF

Dyno Test Comparison PDF 52031_52025_52010 .PDF

Patterned after our outstanding Hurricane for conventional small block Chevys, this new manifold is suitable for use on Chevy V8 engines employing Vortec (Gen 1+) cast iron heads or the Edlebrock E-Tec aluminum heads. This is an ideal manifold for circle track racing and our Hurricane for conventional Chevy 23° heads is in wide use in many racing applications. Our Hurricane design has been proven on many dyno tests to match or outperform competitive manifolds on high horsepower competition racing engines. See page 12. You can spend more money for a single plane racing manifold for your small block Chevy, but you won’t get a better performing manifold than one from Power+Plus.

When we introduced our Hurricane for Vortec several years ago we made some subtle changes in the runners and the port dividers that were different from our standard Hurricane for 23° heads. One of our astute engine builders noticed this and modified our Vortec Hurricane to fit the standard heads. This made a significant improvement in power. So for the last several years we have considered making a 23° head version of that design for our racer customers. Here it is. Various dyno tests on engines ranging from 350 to 400 cid have shown anywhere from 7 to as much as 20 more horsepower out of this manifold over the standard Hurricane on 23° head engines. Variations are due to different engine combinations but every one showed an increase. We are now including the original Vortec version under the Hurricane+Plus name.

Read more about the Hurricane+Plus on our New Products page.

The Super Hurricane is designed for large cubic inch engines. Many SB Chevys are being built today in the 421 to 430 cubic inch range yet racers are trying to run the same manifoldsthat were designed for 400 inches or less. Usually less. So if you have a big inch small block, or an alcohol engine of any size, you need to use a manifold that has been specifically designed for that type of engine. This manifold features a larger plenum and bigger runners. To our knowledge, there is no other 23° head intake manifold that has been specifically produced for big inch engines. Do not attempt to use this manifold on 350 to 400 inch engines as it will not make the same power as our Hurricane or Hurricane+Plus. This manifold has injector bosses and is available machined for injectors. Dyno tests show excellent results on injected engines even with the larger runners since the manifold runs dry.

Note: Use Professional Products 10608 Fuel Rail Kit with injected versions of this manifold.

Dyno Test PDF 52036 .PDF