Cylinder Heads

Serious Performance 

The cylinder head works by allowing the air-fuel mixture to enter one valve and the exhaust gas to exit the other. SpeedmasterTM cylinder heads offer improved power throughout the rpm range for greater throttle response and top-end horsepower.


Speedmaster™ cylinder heads feature as-cast ports in both alloy and cast iron and are designed for entry-level street/strip performance applications operating in the idle-to-6500 rpm range. They are available for popular V8 engines. Some of the key features include:

  • • Bronze valve guides
  • • CNC finish faces and bolt holes for extreme accuracy
  • • T6 heat treated gravity die cast construction (alloy heads only)
  • • OEM accessory bolt patters for simply compatibility
  • • Plenty of material for upgrading to larger HP applications
  • • Machined for screw in studs and guide plates
  • • Flame hardened valve seats for use with all fuel


Speedmaster™ CNC ported cylinder heads are machined on dedicated 4-axis and 5-axis CNC machining centers to ensure accuracy and cost effectiveness. Combustion Chamber, Exhaust and Intake Ports all fully CNC machined for better flow. CNC combustion chambers offer superior control over flame travel and quench area. CNC Ported heads eliminate human error and variation from port to port.

Unsurpassed repeatability from one cylinder head to another that is commonly found in “Hand porting & Polishing”. Combustion chambers are exact in volume - so every cylinder has the same compression ratio. Each port is the same cross section - so every cylinder can reach higher true RPM potential. CNC machining produces ports and chambers to within tolerances of no more than .002”;
in turn every cylinder can reach the same power potential and accurate tuning.

Assembled Cylinder Heads


Just bolt on a set of complete heads for instant power - cos we've done all the hard work for you! Plus, you can turn up the horsepower even more by choosing heads with CNC-ported runners and chambers, CNC-profiled chambers and other enhancements. Speedmaster cylinder heads offer great performance for less than it would cost to rebuild an old set. 

Complete Cylinder Heads Range:

Street Series

Hydraulic Flat Tappet

The perfect cylinder head, designed for entry-level that results in great driveability, power and economy. Operating within the idle-5500 rpm range - they fit the bill perfectly.

  • • Entry Level Street Application
  • • Idle - 5000 RPM
  • • 50 States Legal

SuperStreet Series

Solid Flat Tappet

For the more serious street application, the SuperStreet Series boasts high quality intake and exhaust valves and valve springs suited for daily drivers and tough street machines. Throttle response and power range from 1500 - 6500 RPM.

  • • High Performance Street Application
  • • 1500 - 6500 RPM
  • • High quality components

Outlaw Series

Hydraulic Roller

For the ultimate in Street Performance, look no further than the Outlaw Series. For those racers looking for a head with 500+hp potential, this is it! Known for giving you the optimal airflow combination for maximum engine performance.

  • • High Performance Street & Light Racing Application
  • • 1500 - 6500 RPM
  • Lightweight Valve Springs for maximum lift

Sportsman Series

Solid Roller

Extremely aggressive , suited for next level all-out competition. The Sportsman Series offer high horsepower and excellent torque. Not intended for street application.

  • • Race Application
  • • High Horspower+ Potential
  • • CNC ported for max HP & Torque

Racer Series

Race Solid Roller

Competition-ready heads feature fully CNC machined combustion chambers and blended seats for increased air flow and well as revised exhaust valve angles for larger intake valves.

  • • Race Application
  • • High Perofrmance Chrysler 426 & 572 HEMI engines
  • • Fully CNC Machined Combustion Chambers
  • • Billet Aluminum

Premium Components

Speedmaster Cylinder Head parts have been assembled with the finest premium components to provide your engine with optimal airflow for maximum engine performance. Head Build Kits include the following: Intake Valves, Exhaust Valves, Valve Spring Retainers, Valve Locks, Valve Springs, Valve Stem Seals, and Valve Spring Locators.

Valvetrain Components

    From Street to Race ready performance, we’ve got it all covered


    We’ve done all the hard work for you. Heads are ready to bolt on right out of the box


    Made from high quality components, built to last and assembled in our California facility


Built with precision

Our Cylinder Heads are built and assembled in-house at our facility in California. Using only high-grade components, our team of machinists and engineers with 40+ years experience get the job done with quick turnaround time and proven precision and assured quality control. Bolt on a set of fully assembled heads for instant power gains! 

Bare Cylinder Heads

Also Available

Speedmaster Bare cylinder heads offer improved power throughout the entire rpm range for greater throttle response and top-end performance.

Shop Bare