Carb Clarification and help

[Alan Roehrich]

You can add a secondary metering block, and you can use bigger float bowls. You can modify the metering blocks as to how they meter fuel (most use a 2 barrel Holley HP metering block).

You cannot change anything that relates to how it flows air.

If you want to modify a Holley for your car, honestly, the best thing you can do is just send it to Jimmy Bridges in Nashville TN, or Clark Holroyd, in California. Their stuff, out of the box, will be so close that you're unlikely to improve on it, and will only need very minor jetting changes. If you're not an absolute expert, you'll spend 5 times as much trying to do it yourself as you would to just send the carburetor to either of them, possibly hurt some parts in the process, and you will probably still not go as fast as you would with their stuff.