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Complete Cylinder Heads- Unported
Pontiac V8 Complete Cylinder Heads- Unported
As the Foundry Left Them — Complete Cylinder Heads- Unported for Pontiac V8s
Unported cylinder heads are aluminum Pontiac heads with the ports as the foundry left them. On an Edelbrock Performer RPM casting that is not a compromise — the port is deliberately compact and high velocity, with extra thick walls, and it makes strong low-speed torque and throttle response before anyone touches it with a cutter.
This is the value tier of Butler's head program. It covers bare castings, complete D-port heads and complete round port heads, from Edelbrock, Speedmaster and Butler Built, in 65cc, 72cc and 87cc chambers with flat tappet or hydraulic roller spring packages.
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More About Complete Cylinder Heads- Unported
1. Three Ways to Buy an Unported Head
The subcategories here are not three price points for the same thing. They suit different builders.
| Bare castings | Guides and seats only. For a builder who is having them ported, or who has a specific valvetrain package in mind and does not want to pay for one twice. |
| D-port complete | The factory-shape exhaust port, so stock-style manifolds and standard D-port headers still bolt up. The path of least disruption on a car that already runs. |
| Round port complete | The Ram Air IV flange with larger 215cc intake runners. More air, but round port headers are mandatory. |
2. Unported Does Not Mean Unfinished
Two things worth knowing before you decide the porting is essential.
| Chamber machining is separate from port work | Edelbrock's Fast-Burn CNC chambers are fully CNC machined even on unported heads, which is what makes them consistent and precise cylinder to cylinder. |
| The core is porting-friendly | Extra thick port walls and a compact port size are exactly what a CNC or hand porter wants. An unported pair bought now is still a valid core for 325 cfm on D-port or 340 cfm on round port later. |
| Butler Built is a middle step | Same casting, same as-cast ports, but disassembled, machined, blueprinted and assembled in Butler's shop with Ferrea valves and a spring package matched to your actual cam. |
3. The Two Specs You Have to Get Right
Whichever subcategory you land in, these two follow you.
| Chamber volume | 65cc on D-port only, then 72cc for higher compression and 87cc for street-legal compression on 92 octane. Edelbrock rates the CNC machined 72cc and 87cc chambers at 9.5:1 with flat top pistons. Butler can also mill a casting to a target number. |
| Spring package | Flat tappet and hydraulic roller are separate listings for a reason. Pick the cam before the heads ship, and send the cam card so the spring setup is verified rather than assumed. |
If the engine is a street car, the exhaust is staying, and the budget is not unlimited, unported is where most Pontiac builds should start. Ported heads earn their money on a bigger engine with a bigger cam behind them.
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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.