1482144 | CATERPILLAR C12 LOADED CYLINDER HEAD, NEW

C10 Engine Specifications:
Year – 1996-2002
Liter – 10.3
CID – 629
Bore – 4.9212″C12 Engine Specifications:
Year – 1996-2003
Liter – 12
CID – 730
Bore – 5.1181-5.1211″

Cylinder Head Specs for C10/C12
Casting:
Minimum Thickness – 4.108″
New Thickness – 4.128-4.140″
Valve:
Stem Diameter – .3714-.3720″ (intake and exhaust)
Head Diameter – 1.7715-1.7725″ (intake), 1.6535-1.6545″ (exhaust)
Angle – 29.25* (intake), 44.25* (exhaust)
Seat Angle – 30* (intake), 45* (exhaust)
Seat Outside Diameter – 1.8120″ (intake), 1.7080″ (exhaust)
Seat Insert Bore Depth – .587-.595″ (intake), .551-.559″ (exhaust)
Valve Spring:
Outer Spring Free Length – 2.358″
Outer Spring Installed Height – 2.035″
Outer Spring Open Test Press – 139-149 LBS at 1.485″
Outer Spring Close Test Press – 49-59 LBS at 2.035″
Inner Spring Free Length – 2.417″
Inner Spring Installed Height – 1.937″
Inner Spring Open Test Press – 63-69 LBS at 1.387″
Inner Spring Close Test Press – 29-34 LBS at 1.937″
Installation:
Intake Valve Lash – .015″ COLD
Exhaust Valve Lash – .025″ COLD
Torque – Full Shank: #1-26=99-121 FT/LBS +90°, #27-33=15-25 FT/LBS

C12 Engine Specifications:
Year – 1996-2003
Liter – 12
CID – 730
Bore – 5.1181-5.1211″

Tips:
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