Here’s the latest reader question, along with my reply!
Mike asks: I know you’re an old school carburetor guy so I figured you’d be the right guy to ask about putting spacers under a carb. I’ve read and heard about doing this as a way to get more power out of the engine. Is it true? Are there any downsides?
The general idea behind spacers is to increase the velocity of airflow and thereby create more power; however, depending on the engine and factors such as how it is cammed as well as the flow characteristics of the existing/factory intake manifold, a too-high spacer can result in worse airflow and reduced power. This is why people usually experiment with them. The problem is that without a dyno, it is very hard to objectively quantify the results as the differences are usually small (maybe 3-5 horsepower – maybe). What sometimes does change noticeably is the way the engine feels/responds. It may seem more – or less – so. It may feel a little stronger at lower – or higher – RPM.
It’s fun to experiment!
And no real harm can come from it. Just be sure to make sure the throttle arm/kickdown adjustments are right and don’t close the hood hard before you have established the clearance relationships!
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