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- Butler Built Edelbrock RPM CNC Ported Cylinder Heads
Butler Built Edelbrock RPM CNC Ported Cylinder Heads
Pontiac V8 Butler Built Edelbrock RPM CNC Ported Cylinder Heads
Ported In House, Shipped Assembled — Butler Built Edelbrock RPM CNC Ported Cylinder Heads for Pontiac V8s
Butler Built CNC ported heads start as genuine Edelbrock Performer RPM castings and are ported in Butler's own shop, then assembled complete and shipped ready to bolt on. This is the volume tier of Butler's head program: more flow than any out-of-the-box Pontiac head, without moving to a wide port or a race-only casting.
Two families live here. The D-port version is CNC ported to 310-325+ CFM and keeps the factory-style exhaust port; the round port version is ported to your choice of 310, 325 or 340 CFM on the Ram Air IV flange. Both come with Ferrea valves, matched springs, ARP studs and guide plates.
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1. Pick the Flow Number, Not the Head
The casting is the same Edelbrock Performer RPM core either way. What you are buying on this page is how much of it Butler's CNC program removes.
| D-port, 310-325+ CFM | The ceiling for a D-port Pontiac head. It keeps the factory exhaust port, so the headers and manifolds on the car stay. |
| Round port, 310, 325 or 340 CFM | Three porting levels on the Ram Air IV core. 340 is the top of the standard round port program. |
| Which one | More port than the engine can use costs you velocity and low-speed manners. Give Butler the displacement, the cam and the converter and the flow tier picks itself. |
2. Valve Size Goes Up With the Port
This is the part people miss when they compare flow numbers between tiers. The bigger port is not just a bigger port.
| 2.11" intake | Used through the 310 and 315 CFM level, paired with a 1.66" or upgraded 1.77" exhaust. |
| 2.19" intake | Required once you are at the 325 and 340 CFM programs, with a 1.77" exhaust. Butler uses the 2.19 valve in 325 and 340 CFM CNC ported heads as a matter of course. |
| Why it matters | The bowl is cut for the valve the program was written around. You cannot order the flow and keep the small valve. |
3. What "Complete" Means Here
These ship assembled. Nothing on this list is an upcharge line that appears later.
| Valvetrain | Ferrea stainless steel valves, performance valve springs matched to your application, chromoly locks, retainers and locators, and Viton valve stem seals. |
| Hardware | ARP rocker studs and guide plates, installed. |
| Included machining | Chambers are polished and the pushrod holes are slotted for 1.65 rockers, both included in the price. Standard valvetrain components throughout. |
| Gaskets | SPM-5410-2 is the recommended intake gasket set on the D-port heads and can be added to the order. |
4. Chamber, Valves and the Rest of the Build Sheet
Each pair is configured when you order rather than pulled off a shelf.
| Combustion chamber | 65cc, 72cc or 87cc on D-port; 72cc or 87cc on round port. 72cc is the higher compression, performance and race chamber; 87cc is the street-legal compression choice on 92 octane. |
| Chamber finish | Round port sets can be hand-polished or CNC-machined. |
| Valves and retainers | Ferrea 5000 for street performance or 6000 competition grade; chromoly, titanium, or PAC titanium with PAC locks. |
| Cam specs | Supply them. The spring package is confirmed against your actual cam, not a guess at your combination. |
| Stealth | Logo removal with optional custom-matched paint. |
| Upgrades | Roller valve springs, titanium retainers and additional milling for compression. |
5. Fitment and Intake Matching
Ported heads move the intake question to the front of the list.
| Engines | Built for 1965-79 Pontiac 389-455 V8s. A 350 can run the D-port version with 1.66" exhaust valves and a clearanced block. |
| D-port exhaust | Stock-style manifolds and standard D-port headers, with stock valve cover and accessory bolt locations retained. |
| Round port exhaust | Ram Air IV flange, so round port headers or Ram Air manifolds are required. |
| Intakes | On the round port heads, compatible intakes all require port matching. Hurricane sits at factory height, Crosswind is 1" taller, and the Edelbrock Performer is factory height, which matters on a Shaker car. |
| Already own a set | Edelbrock D-port or round port heads you already have can be sent to Butler to be ported and upgraded instead of buying a second pair. |
Butler has flow bench, dyno and track time behind these combinations, from seven-second race cars down to daily drivers. Call with the engine and the target and we will match the port, the chamber and the valve size in one pass.
Not sure what your Pontiac needs?
Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.