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Power+Plus Manifolds
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Fits 1957 - '95 Engines The Power+Plus PS (Performance Street) manifold is the ideal street manifold. It is street legal on a wide range of applications (see catalog for details) and provides significant increases in power and torque.
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The
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. Available at performance parts retailers throughout the U.S.,
Canada, Australia, and Japan.
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 Performance Street Manifold for Small Block Chevy w/ Vortec Heads (non-EGR)
The Power+Plus PS (Performance Street) manifold is the ideal street manifold for street rods or engine swaps using the popular 1996 and later Vortec (L31) cast iron heads.
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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. Note: These manifolds are not legal for sale or use on any pollution-controlled motor vehicles. |
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Fits 1957 - '95 Engines The Power+Plus HPS (High Performance Street) manifold is an outstanding performance street manifold that produces more power and torque than similar competitive manifolds yet sells for a lot less money.
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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 drivability typical of a dual plane. The HPS 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 bowtie heads and '87-'95 cast iron or aluminum heads. Will not fit under a stock Vette hood. Note: These manifolds are not legal for sale or use on any pollution-controlled motor vehicles. |
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Fits 1957 - '95 Engines The Power+Plus CrossWind manifold is similar to the 52020/52021 above but features an open area under the plenum and port runners. This allows air to pass through this area cooling the intake charge which produces more power and torque.
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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 due to the special
design. Note: These manifolds are not legal for sale or use on any pollution-controlled motor vehicles. |
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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. Note: These manifolds are not legal for sale or use on any pollution-controlled motor vehicles. |
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Fits 1957 - '95 Engines The Power+Plus HPR (High Performance Racing) manifold is the best performing manifold of this type that you can buy, regardless of cost. Yet the Power+Plus manifold is one of the least expensive manifolds of this type on the market.
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Power+Plus Hurricane Manifold is a single plane 360° design that provides
optimum power in the mid- to upper rpm ranges. Use with any standard square
bore performance carb. Features include nitrous bosses, dual distributor holddowns, four corner water ports, and more. Kit also includes special water flow divider which can be substituted for a thermostat for racing use. The Power+Plus Hurricane ports are very specifically positioned to provide an optimum starting point for custom porting. The ports are slightly smaller than Fel-Pro's #1 205 gasket. Ideal manifold for drag racing or short track use. Use a 1" (short track) or 2" (drag race) carb spacer for optimum results. While this manifold is designed to be port matched for racing, if it is used in a non-racing application no port matching is required. Manifold provides all standard bosses and tapped holes for street accessories. Fits standard port location 23° heads including cast iron Bowtie, Dart Iron Eagle, World, plus most aluminum aftermarket 23° heads.
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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. 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. Note: These manifolds are not legal for sale or use on any pollution-controlled motor vehicles. |
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Why
Power+Plus Manifolds will fit up through 1995 Small Block Chevy Engines...
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Up
through 1986, the
bolt pattern on all small block
Chevy engines was exactly
the same. From 1987 through 1995, the four center mounting bolt holes
(two on each side) were at a
different angle. This change applied only to Chevy cast
iron manifolds. The aluminum manifolds were the same. Whereas
every other manifold company has a
few additional models to fit these later heads, every one of
Professional Products' SB Chevy manifolds will fit all years up through
1995. This is accomplished by
slotting these four center holes and supplying drop in bushings which
change the bolt hole angle to fit
the late heads. On the early heads, you simply use flat washers on the
slotted holes. Note this does not apply to the Vortec manifolds, which
do not have the four center holes.