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Old 11-17-2006, 05:12 PM
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Default Mods for Holley 1920 Mac 72hp

I have a 72hp Mac with a Holley 1920 carb. I'm looking for the "4 Mods" that are required for this engine and carb setup. From what I can tell the bolt holes almost line up, but the throttle linkage hits the top of the engine. I've re-jetted it to a #66 jet and got rid of the vacuum choke assembly in favor of a manual choke operation. Is there a special spacer that I need to get to bring the carb farther up off the engine so it will clear, or can I just mill a little off the side? Curious as to what others have done to adapt this.
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Old 11-18-2006, 05:14 AM
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Default Photo of Spacer

Here is a spacer from a photo I found on the internet, I think this is why my carb does not fit. Looks like also studs were used instead of bolts to attach the carb to the spacer, so I would need two gaskets. Does anyone know where you can get a spacer like this one? Also I want to leave my choke plate on, so I can have a regular K&N filter, I notice this one, they removed that, for choke I'm guessing they use their hand. From what I can see this is a 1920 style carb.
-GGriffin-
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Last edited by ggriffin924; 11-18-2006 at 05:17 AM. Reason: update notes
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Old 11-18-2006, 12:41 PM
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Default

Griffin, I have a spacer for you. Call me Mon.& I can ship it with your fuel pumps. The choke should be removed but leave the hold down for the air cleaner. We use the acelerator pump as the preferred method of priming the engine. Studs are used for the carb on the base.
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