Volume III, Issue 3, Page 33

I love carb spacers because they’re one of the best tuning tools I have. Yep, tuning tools.  I can use a spacer to fine-tune the last few ounces of power out of an engine and a carb spacer might tell me that my engine was tuned well enough without it. I listen to what the spacers tell me. Testing a new engine combination, I always try one or two of them, and I’ll usually end up with a little more power because of it. Carb spacers are funny that way.

Carb spacers were traditionally the open type and simply a way to add volume to the plenum.

You can get ‘em two ways: with one big big opening or with four holes. An open spacer adds volume to the intake plenum and by moving the carb further away from the runners, the spacer gives the air and fuel more time to blend during its transition from vertical to horizontal. This is important.

A typical 4-hole spacer helps to increase air and fuel velocity through the carb to improve the signal and “ram” effect, but there’s lately been a revision of the classic 4-hole design, the 4-into-1 spacer. Basically, CNC-machining has enabled manufacturers to design intricate shapes into their spacers and they are able to blend all four holes into one big opening at the bottom, affording the best of both worlds. Ultimately, most spacers insulate the carb to keep fuel cooler.

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