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Most crate engines, like this Chevy 604 which is by far the most popular option, are typically basically street engines with low compression and relatively inefficient combustion chambers. They also usually have a restrictive intake system, which limits the amount of air and fuel that can be moved during the intake stroke. Because of this, they can see significant horsepower gains from an oxygenated fuel which helps pack extra oxygen molecules into the combustion chambers. View Related Article
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