The Power+Plus Cyclone Manifold is a direct replacement manifold for the stock manifold on Chevy big block engines with general duty oval port heads. See note below for specifics. This manifold will not fit under the hood of Corvettes without hood modifications. Will not fit “tall block” V8s. May be used with OEM or aftermarket carburetors. For street applications use the stock Quadra-Jet carburetor. For street performance use a 650-750 cfm performance or double pumper carb and for competition use a 700-850 cfm double pumper. Note that the Power+Plus Manifold kit includes a carb adapter plate and gasket to allow the use of square bore carburetors. Square bore carbs on this manifold are not legal for use on any emission controlled vehicle. Will fit 1965 through 1990 oval port cylinder heads. Use a Professional Products #53600 gasket or a Fel-Pro #1210 (non-Printoseal) or #1212 (Printoseal) intake gasket with this manifold.

50 STATE LEGAL. Note: This is a stock replacement/street legal part for 396, 402, 427, and 454 V8s with OEM 4-bbl carb; 1965-’72 (1973 non-CA) passenger cars and 1966-’83 trucks, Suburbans, and heavy vehicles; except stock equipped EGR.

Now available for the big block Chevy engine is this terrific Crosswind design manifold. It features oval ports, nitrous bosses, dual distributor holddowns and four corner water ports. This is the utlimate street manifold for 396, 427, 454 or 502 big block engines. It features a raised plenum area that allows air to pass under the plenum, producing a cooler intake charge with a resultant increase in power and torque output. Uses same gaskets recommended for above manifolds.

These manifolds for Big Block Chevys are a worthy companion to our phenomenally successful single plane small block racing manifold. Designed for serious performance big block applications, they feature nitrous bosses, dual distributor holddowns, four corner water ports, and are available for both rectangular or oval port cylinder heads. Rectangular port size at the gasket flange is 1.69-inches wide by 2.31-inches tall, which can be opened up to match the gasket and/or larger port cylinder heads. Runner size is effective for 468 to 540 cid engines. This manifold is available in a satin or show polished finish. Note: Use Professional Products intake gasket # 53601 or Fel-Pro intake gaskets #1211 (Printoseal) or #1275 (non-Printoseal). Both of these gaskets are the standard 1/16-inch thickness. Fel-Pro also offers a 1/8-inch thick non-Printoseal gasket set #1239 which could be required in some instances where the cylinder heads have been machined. Use an 800 cfm or larger 4150 square bore carburetor.

Dyno Test PDF 53030 .PDF

Our single plane big block manifold is now available with Dominator (Holley 4500) carburetor flange. Dual distributor holddowns. Nitrous/injector bosses. Four corner water ports. Available with show polished or satin (unpolished) finish. Priced over $100 less than many similar competitive single plane intake manifolds. Fits big block Chevy rectangular port cylinder heads on standard deck blocks.

Note: Use Professional Products 10626 Fuel Rail Kit with injected versions of this manifold.