
Inner Bearing Spacer Length (1) 50.78 MIN 1.999
50.82 MAX 2.001
Outer Bearing Spacer Length (2) 50.67 MIN 1.995
50.75 MAX 1.998
Fan Hub End Clearance 0.08 MIN 0.003
0.25 MAX 0.010
Thermostat Housing Assembly - Rebuild Specifications
Radiator Thermostat Seat Height 38.18 MIN 1.503
(Big Cam IV and New Big Cam IV) 38.28 MAX 1.507
Bypass Thermostat Seat Protrusion
(Big Cam IV and New Big Cam IV)
• 49 State Engine (EPA Certified) 3.18 MIN 0.125
3.56 MAX 0.140
• 50 State Engine (EPA and CARB Certified) 4.70 MIN 0.185
5.00 MAX 0.197
Radiator Thermostat Seat Bore I.D. 44.386 MIN 1.7475
(Big Cam IV and New Big Cam IV) 44.437 MAX 1.7495
Radiator Thermostat Seat O.D. 44.462 MIN 1.7505
(Big Cam IV and New Big Cam IV) 44.513 MAX 1.7525
Bypass Thermostat Seat Bore I.D. 44.386 MIN 1.7475
(Big Cam IV and New Big Cam IV) 44.437 MAX 1.7495
Specifications Thermostat Housing Assembly - Rebuild Specifications
NT 855 Page 18-59
Part or Assembly Ref. Point mm in
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