Complete Cylinder Heads- CNC Ported

Your engine will only make a much power as the amount of fuel and air that can get in. Butler CNC Ported cylinder heads takes Edelbrock castings and opens the ports up to a variety of sizes for your application. All of our port modeling is done in house so we have control over port design and flow.

The Airflow Advantage: Butler Performance CNC Ported Cylinder Heads

In the pursuit of maximum horsepower from the classic Pontiac V8, the cylinder heads are the single most important component. While factory iron heads are notoriously restrictive, simply bolting on a set of stock aluminum heads leaves significant power untapped. Butler Performance, drawing on its decades of engine building and racing expertise, offers the definitive solution: CNC Ported Cylinder Heads, meticulously optimized for maximum airflow and consistency across every cylinder.

These heads are not merely polished; they are precision-machined flow systems that transform the Pontiac's breathing capability, making them essential for any serious $500\text{hp}$ and above build.

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D-Port Ported Cylinder Heads

BP has conducted extensive flow bench, dyno, and track testing with these heads, all resulting in great performance numbers. We have cylinder head packages for any application, from 7-second...More Details »

Rd-Port Ported Cylinder Heads

Victor Pro Port Cylinder Heads

Edelbrock Aluminum Pro Port Cylinder Heads Victor Pro-Port Raw: These new heads are the ultimate choice for extreme Pontiac race applications. They feature raised intake port openings...More Details »

Wide Port Cylinder CNC Heads

Butler Performance's CNC wide port Edelbrock heads are some of the best flowing Pontiac heads available today. These heads have completely CNC ported intake and exhaust runners, so they are much...More Details »

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More About Complete Cylinder Heads- CNC Ported

Watch as Kevin and Angus from the Junkyard Digs YouTube channel using Butler Performance CNC Cylinder Heads

The Foundation: Premium Aluminum Castings

Butler Performance primarily uses high-quality aluminum cylinder head castings from manufacturers like Edelbrock (specifically their D-Port and Round Port designs) as the starting point. These castings offer an immediate weight reduction and superior thermal properties over cast iron. However, the true performance gain comes from the Computer Numerical Control (CNC) work.

What is CNC Porting and Why is it Essential?

CNC porting is a process where the air intake and exhaust runners are mapped, digitized, and precisely machined by a computer-controlled cutting tool.

Maximum Flow Consistency: The most significant benefit is consistency. Hand porting, no matter how skilled the artisan, results in slight variations between runners. CNC machining ensures that every single runner on every single head is identical to the proven, optimal Butler master profile. This translates directly to balanced cylinder filling and consistent, maximized power output across all eight cylinders.
Optimized Airspeed: Butler’s proprietary CNC programs focus not just on flow volume (CFM), but on maintaining port airspeed. High airspeed is crucial for fuel atomization and strong torque production across the RPM range.
Volume and Power: The result is staggering flow increases. Butler's CNC-ported heads can achieve flow numbers well over $300\text{CFM}$ (Cubic Feet per Minute) on the intake side, with their highest-tier CNC packages approaching the $340\text{CFM}$ mark—a level capable of easily supporting $700\text{hp}$ and more.

Butler’s CNC Porting Tiers

Butler Performance offers various tiers of CNC porting to match the builder's specific performance goals and budget:

Porting Tier	Flow (Intake CFM)	Power Application	Key Feature
Stage 1 CNC	Approx. $275 - 300\text{CFM}$	Street/Strip ( $550\text{-}600\text{HP}$ )	Excellent port velocity, ideal for $455/\text{stroker}$ engines with hydraulic roller cams.
Stage 2 CNC	Approx. $300 - 325\text{CFM}$	High Performance Street/Race ( $600\text{-}680\text{HP}$ )	More aggressive profiling, optimized for larger cams and high-RPM use.
Max Effort CNC	$325\text{CFM}$ and up	Dedicated Race/Extreme Street ( $700+\text{HP}$ )	Maximum port volume, requires the largest cubic inch stroker engines and race valvetrain.

Complete and Ready to Bolt On

A crucial component of the Butler offering is that the heads arrive complete and ready to bolt on. The package includes:

High-Quality Valves: Oversized, severe-duty stainless steel intake and exhaust valves.
Performance Springs: Precision-matched dual or triple valve springs, retainers, and locks specifically chosen to handle the high lift and rapid acceleration rates of Butler's recommended hydraulic or solid roller camshafts.
Valvetrain Prep: All spring pockets are machined, guides are checked, and the seats are given a precision multi-angle valve job to ensure perfect sealing and flow right out of the box.

By investing in Butler Performance CNC Ported Cylinder Heads, the enthusiast is buying a proven increase in engine efficiency and power, backed by the knowledge and testing that has made Butler the premier name in Pontiac performance.