
Cast Aluminum Cylinder Head Big Block Pontiac 389, 400, 455 Ram Air IV
- Intake Valve: 2.110 in.
- Exhaust Valve: 1.660 in.
- Max Lift: .580 in.
- Coil Bind: .740 in.
- Sold as a pair
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Ditch Restrivtive, Heavy Cyclinder Heads for Speedmaster Performance Heads
One of the best upgrades for your engine is to replace cast iron heads with a better performing and lighter aluminum head. Speedmaster's line of performance cylinder heads have proven themselves time and time again both on the track and on the dyno. Many variations are offered for popular Small and Big Block engines to bring performance output to the next level. Available in as-cast for mild street applications and in Fully CNC machined for the serious enthusiast.
![Heavy-Duty Piston Installation Tool [Nylon Composite, White]](https://www.jegs.com/images/mini_200/700/778/778-67571.jpg)


![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)



![1/2 in. Drive Torque Wrench [10 to 150 ft. lbs.]](https://www.jegs.com/images/mini_200/500/555/555-m200db.jpg)

![Precision Cam Degree Wheel Kit [11 in.]](https://www.jegs.com/images/mini_200/500/555/555-81621.jpg)









