Cylinder Heads

Want more reliability and a cylinder head you can trust? Our Freedom Series cylinder heads will give new life to your engine. Each head is manufactured in our state-of-the-art Freedom Racing Engine Shop and guaranteed to meet or exceed factory specifications. 

Cylinder Heads : 
Cummins 5.9L / 6.7L Street
Perfect for a daily driver, our Street head is rated for use up to 700hp.  If your engine configuration is exceeding factory RPM limits a Street HD or Performance Series head with higher valve spring rates is required. 
 
Freedom Series Street heads Include:
  • 11 Screw in Freeze Plugs (eliminates coolant leaks)
  • Hardened, oversized press-in valve seats
  • New Cummins valve springs
  • New valve guide liners
 
 
Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide. 
 
 
Cummins 5.9L / 6.7L Street HD

Perfect for a daily driver or heavy duty towing, our Heavy Duty Street head is rated for use up to 700hp.  

Freedom Series Heavy Duty Street heads Include:

  • 11 Screw in Freeze Plugs (eliminates coolant leaks)
  • Hardened, oversized press-in valve seats
  • New heavy duty Fleece 105# valve springs
  • Tool steel retainers
  • New valve guide liners

 

Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide.
 
 
Cummins 5.9L / 6.7L Performance Street
Looking to get more out of your 6.7L Cummins? Our Freedom Series Performance cylinder head includes larger valves, 105lb valve springs, and is rated up to 1,100hp!. Whether you are sled pulling, drag racing, or just looking for extra power when towing, our Performance head will get you the power you need.
 
Freedom Series Performance heads Include:
  • Fire ring the cylinder head (All in the head)
  • 11 screw in freeze plugs (eliminates coolant leaks)
  • Hardened, oversized press in valve seats
  • New valve guide liners
  • Manley 1.380" stainless valves
  • New heavy duty Fleece 105# valve springs
  • Tool steel retainers
  • Fire ring gasket kit with multi-layer steel gasket and 4.550" diameter rings
 
 
Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide. 
 
 
Cummins 5.9L 12 Valve Street HD

Our Heavy Duty Streed head for the 5.9L 12-valve Cummins is perfect for a daily driver or heavy duty towing application.

Freedom Series Heavy Duty Street 12 vavle heads include:

  • Hardened, oversized press-in valve seats
  • New heavy duty 160 lb valve springs
  • New valves and top hat valve seals
  • New casting
  • No core charge

 

Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide.
 
6.6L Duramax for the LB7, LLY, LBZ, LMM, and LML

From the Freedom Freedom Racing Engine shop comes a new cylinder head option for the 6.6L Duramax! The lineup includes cylinder heads for all models of the Duramax, from 2001-2016. Each cylinder head is assembled in our state-of-the-art Freedom Racing Engine shop and guaranteed to meet or exceed factory specifications. All heads are meticulously cleaned, inspected, pressure and leak tested, decked, and include new valve guides and springs. Perfect for the daily driver or towing application.

Our LB7 heads feature a cupless injector bore - save time and money with no more injector cups to install, leak, or worry about!

 

Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide. 

 

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