Holley 1" Carburetor Spacer Speedo Switch is plumbed into the

Switch is plumbed into the brake system and is activated by closing the electrical connection with rising brake pressure (60-120 PSI)

Hydration Bite Valve

Sold in pairs and made from 1-3/4" x

Standard and adjustable styles are available in extruded or billet aluminum

Holley 1" Carburetor Spacer Speedo Switch is plumbed into theThese open plenum carburetor spacers are designed to fit either square bore or AFB carburetors. They will raise a carburetor 1" above the intake manifold. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular