Cannon Downdraft Intake Manifold

(Weber Flange / Single Plane)

One of the most important keys to building a performance engine is to have components that all match up and are designed to work together well. You can put the largest cam and carburetor on your engine but without a good flowing intake and exhaust you are just wasting money.

This 20R intake manifold will work perfectly to get you the most performance possible from your engine. With a large open plenum and runners, this manifold will outflow your stocker and supply your performance engine with enough airflow to make the most horsepower possible. This manifold is equipped with a Weber carburetor flange so you can bolt your performance carburetor on the manifold without having to use any adapters. This manifold has all the same vacuum and sensor ports as your stock manifold so you don't have to worry about adapting different fittings together to get all your vacuum lines and temp sensors hooked back up!

This manifold is designed to use a rubber style thermostat gasket. There are a few other upgrades available for this manifold so take a minute to browse through the parts below to see if you will need any of them for your application. If you have any questions please contact one of our sales reps to help you determine what parts you may or may not need.

If you have the 75-82 water neck, this will use a paper thermostat gasket, same as factory.If you have an 83 or later water neck, you will need to use the rubber thermostat gasket, as well as our thermostat housing adapter listed below.

• Intake Manifold Gasket, see Part #: 1032009
• Bolt Water Block Plate(Under Manifold), see Part #: 1032032
• Thermostat Housing Gasket Rubber Round, see Part #: 1032074
• Pro Water Block Off Kit, see Part #: 1016015
• Intake Manifold Plug Kit, see Part #: 1032050
• EGR Block Plate Kit, see Part #: 1016038
• Intake Manifold Stud Kit, see Part #: 1035048
• Weber Spiral Spacer, see Part #: 1033023
• Holley 500 To Weber Adapter Kit, see Part #: 1032021
• Holley 350 Phenolic Spacer, see Part #: 1035087
• Holley 500 Phenolic Spacer, see Part #: 1035090
• Thermostat housing Adapter, see Part #: 1032086

Contact our Tech Support Line for further information at 928-575-2174.