Pontiac Polar Wind Intake, 4500 Series - Machined & Port Matched to Victor Pro Port Heads BPI-PW-Intake-PM-PRO-PORT

About the Butler Polar Wind 4500-series intake: Updated alternative to the BOP intake and upgrade from the Victor and Northwind on higher flow, higher HP applications- minimum head port size is Edelbrock Wideport or KRE 380+ cfm highport 4500 Series Carb Flange Intake was built for applications that are 850HP and higher working in the 5000-8000 rpm power band. Recommended minimum head flow is 370/380 cfm

Matched to Victor Pro Port heads. Machined and port matched to the Victor Pro Port opening (also suits Butler Wide Port / Kauffman heads with the matching wide-port gasket) so your race top-end runs one continuous, uninterrupted runner.

The Butler CNC port-matching process. A port match is only worth doing if it's done right. Out of the box, an intake manifold and a cylinder head are cast separately and never machined to meet each other — leaving a step, offset, or size mismatch at the port opening that trips the incoming air and fuel right at the doorway to the cylinder, exactly where you least want turbulence. For years the only fix was a gasket scribe and a die grinder by hand: slow, inconsistent side to side, impossible to repeat, and easy to over-grind into a reversion step that actually costs you flow. Butler invested in a better way. Every Butler port match is modeled in 3D from the actual head port, programmed into repeatable toolpaths, and cut on our 5-axis Haas UMC machining center using dedicated fixturing that locates every manifold exactly the same way. Each opening is machined to the correct size and shape, then blended smoothly back into the manifold's own casting so the transition is gradual rather than a cliff — identical on all eight ports, cylinder to cylinder.

Why it matters. A machined match is precise, symmetrical, and repeatable, and it's matched to the real port it bolts to — not a generic gasket outline. You get the airflow benefit of a perfect port match without the risk of a hand-grinding mistake that can't be undone. Modeled, machined, matched, and finished in-house by Butler Performance — the Pontiac experts.