>Notice the rotated Air snorkel, also cut to give a 6 sq. in. [ stock is 3"] >opening AND retain the Venturi effect of the original! Just for S&G when I bored out the choke on my 65 Rochester FI from 2" to 2.3" (and epoxied all of the casting voids exposed), airflow went to nearly 900 CFM with minimal drop. Padgett