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Ed Wright · 11-12-2013, 05:13 PM

Don, you may also have to plug the power valve and use larger jets. You may be able to use a lower number (maybe a 35?) Holley power valve. If you plugged it right now you may be able to close the throttle blades enough to cover the transition slots. You likely don't have enough manifold vacuum to hold the power valve shut.
They look about the same, but as many years, and as many Holley & Ford carbs I have rebuilt I never tried a Holley valve in a Motorcraft 2bl. I would verify the Holley valve will work. I would probably just plug it myself. May have to tweak it some to clean it up on the return road.

Good luck.

11-12-2013, 05:13 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: 2 bbl. Motorcraft & a dwell cam Don, you may also have to plug the power valve and use larger jets. You may be able to use a lower number (maybe a 35?) Holley power valve. If you plugged it right now you may be able to close the throttle blades enough to cover the transition slots. You likely don't have enough manifold vacuum to hold the power valve shut. They look about the same, but as many years, and as many Holley & Ford carbs I have rebuilt I never tried a Holley valve in a Motorcraft 2bl. I would verify the Holley valve will work. I would probably just plug it myself. May have to tweak it some to clean it up on the return road. Good luck. __________________ Ed Wright 4156 SS/JA