Carb Tuning
You can tune the point when enrichment takes place by changing step-up springs. This is generally done to cure mid-throttle drivability problems. Various color-coded springs are available, with vacuum ratings ranging from 3 to 8 in-Hg. The more vacuum it takes to activate the spring, the slower the enrichment comes in. Most Edelbrock carbs come with 5 in-Hg-rated springs in the base calibration. View Related Article
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