Carburettor Flange Guide

So you've acquired a project vehicle. You immediately open the hood and are greeted with the news that there's no carburettor or throttle body bolted atop your new engine. How do you find out what you need? This helpful walk-through will steer you through the various popular carburettor flanges.

When it comes to understanding what fits and what stays on the shelf, you need to begin by measuring the bolt spacing of your intake flange. Carburettors have a variety of bolt patterns (measured by length and width) and it is important to note that you need to allow adequate space for the throttle blades to open and close without binding against the intake manifold's ports. That's why Holley has provided handy reference drawings and a poster showing common bolt patterns.

WANT A COPY OF THIS POSTER? CLICK HERE TO DOWNLOAD!

But what if you have a factory spreadbore intake and want to upgrade to a more modern carburettor, like Brawler's 600 CFM 4160? That is why Holley offers a variety of carburettor adapters that allow you to upgrade your carburettor while using the existing bolt pattern, sparing you the expense of replacing your entire intake manifold.

CLICK ON THE LINKS BELOW FOR A PRINTABLE BOLT PATTERN DRAWING OF STANDARD CARBURETOR DIMENSIONS. THESE ARE SCALED TO SIZE AND CAN BE LAID ON YOUR EXISTING INTAKE TO VERIFY FITMENT!