Speedmaster Carburetor Spacer

Speedmaster Carburetor Spacers: Precision-Machined Performance

When it comes to squeezing more power out of a carbureted engine, few upgrades are as straightforward — or as effective — as a quality carburetor spacer. Speedmaster has built a strong reputation in this category by combining modern CNC manufacturing with decades of hands-on performance experience, delivering spacers that serious builders trust on both the street and the strip. Browse the full selection of carburetor spacers to find the right fit for your build.

Built from the Ground Up: 6061-T6 Aluminum Construction

Speedmaster carburetor spacers are individually milled from super-durable 6061-T6 aluminum billets , a material chosen for its ideal balance of lightweight strength and resistance to the harsh thermal environment just above an intake manifold. They also help to insulate the carburetor from engine heat and provide clearance for linkages — two practical benefits that go beyond simple airflow gains. Whether you choose a natural, clear-anodized, black-anodized, or high-temperature painted finish, each spacer is designed to handle repeated heat cycles without warping or degrading.

PCE120 Series: Versatile Styles for Every Application

The core of Speedmaster's carburetor spacer lineup falls under the PCE120 series, offered in both 1-inch and 2-inch thicknesses and in multiple plenum configurations. Options include open-plenum, 4-port square bore, and tapered combination styles , giving builders the flexibility to tune for low-end torque, top-end power, or a blend of both. The precise design of these spacers provides a smooth transition of fuel from the carburetor to the intake manifold, to increase flow for more performance. All PCE120 spacers are designed around the popular 4150 square-bore flange, making them compatible with a wide range of Holley-pattern carburetors and intake manifolds.

For builds running larger carburetors, Speedmaster also offers 2-inch spacers in a 4500 square-bore, 4-port, CNC-machined, clear-anodized configuration under the PCE120.1010 part number — a solid choice for big-block and high-output applications that demand maximum flow area.

Builders who prefer a non-metallic option will appreciate that Speedmaster also produces a 1-inch phenolic/Bakelite carburetor spacer in a square-bore, 4-port design . Phenolic is valued for its superior thermal insulation properties compared to aluminum, making it a popular choice for engines prone to heat soak.

PCE474 Series: Nitrous-Ready Burst Panel Spacers

For racers running direct-port nitrous systems, Speedmaster's PCE474 series steps up with specialized adapters designed to meet sanctioning body requirements. Use of these spacers is the only way to meet the requirement by the IHRA and other sanctioning bodies for burst panel protection when using a direct port type nitrous system on a cast intake manifold — and they are precision-machined from billet aluminum with a military-spec hard coat for durability and corrosion resistance. The PCE474.1002 spacer adapter not only adds extra space and air to your carburetor, but allows you to vent pressure from 75 to 90 psi using built-in check valves , eliminating the need to replace burst panels after a backfire event.

Track Proven, Globally Engineered

Founded in 1979, Speedmaster has become a leader in its field, built on long-term consistency as a specialist in aftermarket automotive components — beginning as a small speed workshop and growing from a one-man operation into a worldwide high-performance powerhouse. With over 25,000 components, cutting-edge facilities across three continents, and more than 400 skilled staff, Speedmaster serves enthusiasts who demand the best — on the street, track, or strip. Their carburetor spacers reflect that same "Track Proven" philosophy: engineered to perform, finished to last, and backed by the kind of manufacturing precision that comes from doing this for over 40 years.