Ultra Pro Billet Carburetor Spacers

All our carburetor spacers are fully CNC machined from billet 6061-T6 aircraft aluminum. We offer spacers for Braswell, Holley, and Dominator 4-barrel carburetors in four styles- open, four-hole, hi-flow, and angled. Many of our spacers are available in an ultra-light version, which are some of the lightest spacers on the market. We also make manifold shear plates and inserts for Dominator style carburetors.

Part # Description Price
UPM-4150-1CLS 1" 4150 Holley Hi-Flow Splitter Carburetor Spacer $110.00
UPM-4150-1CL 1" 4150 Holley Hi-Flow Lightened Carburetor Spacer $113.00
UPM-4150-1.5CL 1.5" 4150 Holley Hi-Flow Carburetor Spacer $142.00
UPM-4150-2CL 2" Holley Hi-Flow Lightened Carburetor Spacer $142.00
Part # Description Price
UPM-DOM-1CNL-2.150 1" Dominator Hi-Flow Carburetor Spacer 2.150" Bore $121.00
UPM-DOM-1CNL-2.200 1" Dominator Hi-Flow Carburetor Spacer 2.200" Bore $121.00
UPM-DOM-2CNL-2.150 2" Dominator Hi-Flow Carburetor Spacer 2.150" Bore $148.00
UPM-DOM-2CNL-2.200 2" Dominator Hi-Flow Carburetor Spacer 2.200" Bore $148.00
UPM-DOM-2CL-2.150 2" Dominator Hi-Flow Carburetor Spacer 2.150" Bore, Lightened $170.00
UPM-DOM-2CL-2.200 2" Dominator Hi-Flow Carburetor Spacer 2.200" Bore, Lightened $170.00
UPM-DOM-CSP.650 Dominator Carburetor Shear Plate .650" Tall $130.00
UPM-DOM-MSPO Dominator Manifold Shear Plate Open $130.00
UPM-DOM-MSPCL Dominator Manifold Shear Plate Clover Leaf $130.00
UPM-DOM-2BCSP.650 Split Dominator Carburetor Shear Plate .650" Tall $121.00
UPM-DOM-2BMSPCL Split Dominator Manifold Shear Plate Half Clover $121.00
Part # Description Price
UPM-4150-2RL 2" 4150 Holley Restrictor Lightened Carburetor Spacer $190.00
UPM-BRAS-2RL 2" 4825 Braswell Restrictor Lightened Carburetor Spacer $190.00
UPM-4150-2RLA-LFD 2" 4150 Holley Restrictor Lightened Carburetor Spacer Angled Left Front Down $229.00
UPM-4150-2RLA-LRD 2" 4150 Holley Restrictor Lightened Carburetor Spacer Angled Left Rear Down $229.00
UPM-4150-1.125-INS 1.125" Restrictor Insert $24.00
UPM-4150-1.25-INS 1.250" Restrictor Insert $24.00
UPM-4150-1.3-INS 1.300" Restrictor Insert $24.00
UPM-4150-1.4-INS 1.400" Restrictor Insert $24.00
UPM-4150-1.5-INS 1.500" Restrictor Insert $24.00

Ultra Pro Restrictor Carburetor Spacers

In Dirt Late Model racing, when the track gets dry slick, even the best handling cars have trouble with over spinning the tires under acceleration. For that, Ultra Pro Machining has introduced a restrictor carburetor spacer. The spacer can be fitted with many sizes of removable inserts and takes away enough horsepower to give more throttle control, but not so much that you will feel down on power to the rest of the competition. The spacer is available in a straight spacer, or an angled spacer.

Dominator Carburetor Spacers and Manifold Accessories

Our billet shear plates are designed to increase the performance of engines with tunnel ram style manifolds. They are machined from billet 6061-T6 aircraft alloy. Our manifold shear plate with its sharp stepped design breaks up fuel droplets and is offered in both an open and clover leaf patterns. When using our cloverleaf model the same diffusion effect takes place as with our Hi-Flow spacers and seems out perform the open stepped design on smaller displacement engines. Engines with a lot of duration tend to have a lot of interference between cylinders in the intake manifold increasing the possibility of reversion. Using our carburetor shear plate in conjunction with our manifold Shear plate will greatly reduce reversion back through the carburetor; increase fuel atomization in the manifold and helps the air flow more efficiently to the runners. We also offer these shear plates for split dominator setups. Split Dominator components are individually priced.

Part # Description Price
UPM-BRAS-1.5CL1.800 1.5" Braswell Hi-Flow Lightened Carburetor Spacer with 1.800" Hole $162.00
UPM-BRAS-2CL1.800 2" Braswell Hi-Flow Lightened Carburetor Spacer with 1.800" Hole $162.00

Ultra Pro HI-Flow Billet Carburetor Spacers

There are many manufacturers producing open design carburetor spacers today many of which do little other than increase plenum volume. The plenum volume effects the wave actions in the manifold also know as ram charging. Changes to this wave action may or may not result in an increase in performance based on the characteristics of your engine. However a properly designed carburetor spacer can perform other functions that will increase power regardless of the particular characteristics of the engine. Air flows poorly over sharp edges, which is why carburetors have a radius at the entry of each barrel. But air also has problems exiting through a hole with sharp edges ie the carburetor base plate. By adding one of our Hi-Flow spacers to this system the air may diffuse outward instead of traveling in a straight path. This effectively reduces the exit losses of the airflow through each barrel allowing any given carburetor to flow more air. Our Hi-Flow spacers also help the airflow turn into the runners. The diffusion action gradually increases the cross-sectional area of each barrel therefore the flow must slow down. This reduction in velocity decreases the kinetic energy of the flow and makes it easier for it to change direction. With the Hi-Flow spacer the air temporarily slows entering the plenum turns and accelerates down the runner. With no spacer the airflow crashes into the manifold floor loses all of its velocity and drops much of its fuel out in the process.

Dominator Carburetor Shear Plate .650" Tall

2" Dominator Hi-Flow Carburetor Spacer

Dominator Manifold Shear Plate Open

Dominator Manifold Shear Plate Clover Leaf

Split Dominator Manifold Shear Plate Half Clover

Braswell Hi-Flow

2" 4150 Restrictor Carburetor Spacer

Restrictor Carburetor Insert

2" 4150 Angled Restrictor Carburetor Spacer

2" 4150 Angled Restrictor Carburetor Spacer With Restrictor Inserts

4150 Hi-Flow

4150 4 Hole Splitter

4150 4 Hole

Split Dominator Carburetor Shear Plate

Slotted Braswell 2" 1.800 Hi-Flow Lightened

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Ultra Pro Machining, Inc.
7100 Weddington Road NW
Concord, NC 28027

Tel: 704-392-9955

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