Carb Spacers Dyno Test - 1964 Falcon 302

by Camren Beattie

This '64 Falcon has a 9.5:1 302 with 289 heads, an E303 cam advanced 2 degrees, and a Typhoon manifold with an old Holley 600cfm vacuum secondary carburetor. It's backed by an AOD and 2800 stall. Since I was upgrading to a 680cfm Quick Fuel vacuum secondary carburetor, I figured I would also try a set of carb spacers and dyno before and after.I used the ProForm Trackside spacer kit which comes with three 1" spacers; open, four hole, and four hole tapered.

The car was dynoed at Adrenaline Autosports. With my old Holley 600 it baselined at 219 HP and 235 ft-lbs of torque.

With the Quick Fuel Super Street 680cfm bolted on it made 231 HP and 268 ft-lbs of torque, pretty much right out of the box with just setting the idle. Air-fuel was good at 13.7:1 across the board.

Then I tested the three spacers. They all were pretty close, and all higher than no spacer, but the open hole made the most power at 245HP and 277 ft-lbs of torque. The tapered was a few HP less, and the four-hole standard was lower in HP and torque.

Captions (From Left to Right)
1.The QFT 680cfm vacuum secondary carb with open hole spacer made 26HP and 24 ft-lbs of torque over my previous combo of an old 600cfm Holley and no spacer.

2. '64 Ford Falcon Futura 2-Door Hard Top test vehicle. Under construction and driven to work.

3. My "before" combo: 600cfm Holley vacuum secondary on top of a Pro-Products Typhoon manifold.

4. The Quick Fuel Super Street 680cfm vacuum secondary. This thing is really crisp and made good power across the board.

5. The ProForm spacer kit. Pretty cool in that you can change out the 1" spacers really quickly without removing the carb studs.

6. Peak dyno sheet.

Typhoon Manifold.... Does not ring a bell with me... is that a duel plane or single plane manifold?

Dual plane, RPM look-alike made my Pro-Products.

Very cool stuff. Thanks for taking the time to share it. That is a very nice gain.

If you use an open hole spacer with a dual plane manifold, it is not more a dual plane.
It become a single plane, so it make more high end power...

Can you post the dyno run with just the new carb and no spacer?

I want to compare the difference in rpms

Thank you