UCF Machineshop Cylinder Heads 
6.6L GM Duramax® Diesel Heads

6.6L GM DURAMAX LB7 HEADS (2001-04, VIN: 1)

• Total online price $2,098 for pair of heads shipped within the Continental US*  (excludes applicable taxes)
• O-ring option: Helps prevent head gasket failure, for another $464
• Porting and Polishing option: just $1288 over base heads (includes O-ringing)

6.6L GM DURAMAX LLY HEADS (2004.5-05, VIN: 2)
6.6L GM DURAMAX LBZ HEADS (2006-07, VIN: D)
6.6L GM DURAMAX LMM HEADS (2007-11, VIN: 6)
6.6L GM DURAMAX LML HEADS (2011-16, VIN: 8) Select LMM

• Total online price $1,760 for pair of heads shipped within the Continental US*  (excludes applicable taxes)
• O-ring option: Helps prevent head gasket failure, for another $464
• Porting and Polishing option: just $1288 over base heads (includes O-ringing)

If you have questions please read our shipping policies or give us a call.

All heads have had the following remanufacturing operations completed:
• Completely disassembled, thoroughly cleaned in our hot acid jetwash
• Cooling system pressure tested
• LB7 heads have all new injector cups and seals installed
• All new valve guides 
• Valves, seats, springs, retainers, and keepers inspected and replaced as necessary
• Resurface the fire deck
• Multi angle performance valve job with 3 angles
• Set spring pressure, spring height, stem height, and valve recession
• New Viton® valve stem seals installed and assemble head

O-ring option, helps prevent head gasket failures:
• O-Ring grooves machined into deck and wire installed

Porting option:
• Multi angle performance valve job with 5-7 angles and radius cut for improved flow
• Porting concentrating on the bowl and seat area of the ports yielding significant gains
• Exhaust ports matched to gaskets
• Intake airflow improvements typically gains 17-25+% below .500" lift
• Exhaust airflow improvements typically gains 18-30% below .500" lift
• Modified to work well with factory and performance cams
• Lowers EGTs, Lowers required boost; Increases Efficiency and Power

For 6.6L GM DURAMAX LML HEADS (2011-16, VIN: 8)
Select 6.6L GM DURAMAX LMM HEADS (2007-11, VIN: 6) Note LML on order
These 2 engines use the same head casting.