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CNC Porting and Head Services
For the dedicated Pontiac V8 enthusiast pursuing maximum horsepower, the cylinder heads are the throttle plate of the engine. While high-quality aftermarket aluminum heads offer a significant upgrade over stock cast iron, reaching the true potential of the Pontiac V8 requires a level of precision only achievable through modern machining.
Butler Performance stands as the industry leader in this field, offering proprietary CNC Porting and Head Services that transform quality aluminum castings into meticulously optimized airflow systems. These services allow builders to leverage Butler’s decades of dyno and track testing, ensuring their engine breathes exactly like a championship-winning unit.
Send us your Edelbrock heads for custom CNC porting. We can arrange to ship your heads to us where they will be inspected CNC ported using our Butler CNC Porting Process.
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More About CNC Porting and Head Services
The Butler Process: Unleashing Hidden Power with Pontiac CNC Porting
What CNC Porting Delivers
CNC (Computer Numerical Control) porting is the process of precisely machining the intake and exhaust runners of a cylinder head using a computer-guided cutter. The core advantages of Butler’s CNC program are:
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Flow Consistency: Unlike hand porting, where variations exist between runners, Butler’s CNC program guarantees that every single runner on every head is identical to the proven, high-flow master profile. This consistency is paramount for balanced cylinder-to-cylinder filling, maximizing thermal efficiency and power.
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Massive Airflow Gains: Butler offers CNC services that take Edelbrock D-Port and Round Port heads to flow levels that were previously unimaginable. Their packages deliver air volumes from to over on the intake side, with the Wide Port CNC options pushing flow even higher for extreme race applications.
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Engineered Velocity: The Butler design prioritizes not just the volume of air (CFM), but the velocity and port shape throughout the entire runner. This optimization improves fuel atomization and torque production across a broad RPM range.
Butler’s CNC Porting Service Tiers
Butler Performance offers CNC porting services on customer-supplied Edelbrock heads, allowing owners to upgrade their existing components:
Note: The flow ratings listed are typical results from Butler’s testing on their specific master profiles, designed to work optimally with Pontiac V8 engines.
Comprehensive Head Services
Beyond the core CNC porting, Butler Performance offers a full suite of machine shop and blueprinting services to ensure the heads are truly race-ready:
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"Edelbrock to Butler Built" Upgrade: This full service takes customer-supplied Edelbrock heads and upgrades them into a fully rebuilt, blueprinted, and assembled set of Butler Built Heads. Services include:
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Disassembly, cleaning, and pressure testing to check for leaks.
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Head deck milling for perfect flatness.
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Installation of high-quality components like Ferrea stainless steel valves and performance valve springs matched to the customer’s cam profile.
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Individual Machining: Butler also offers a la carte services, including:
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Valve Jobs: Precision multi-angle valve jobs are required after porting and are offered as an additional service.
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Milling: Custom milling of the deck surface to achieve a specific combustion chamber volume (CC) and target compression ratio.
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Valvetrain Upgrades: Conversion of press-in rocker studs to stronger 7/16 screw-in studs on factory cast iron heads, as well as pushrod slotting to accept high-ratio rocker arms.
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By choosing Butler Performance for CNC porting and head services, the builder is not just paying for machining time; they are investing in a product that has been rigorously engineered and validated on the dyno and the drag strip to deliver guaranteed Pontiac power.