Pontiac 389 Engine Intake
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Neither the intake (shown) nor exhaust ports were seriously hogged out, as this could hurt velocity and street performance. The procedure nonetheless produced some impressive improvements, upping the intake flow from 262 to 300 cfm at 28 inches of water, and the exhaust from 192 to 215 cfm. The exhaust to intake ratio worked out to 71.6 percent. View Related Article
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