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Mack E7 engine, Cylinder Head Bolt torque 

Step 1 = 90 lb.ft, 122 Nm
Step 2 = 100 lb.ft, 136 Nm
Final step = 110 lb.ft, 150 Nm


Mack E7 engine Specifications

 
Mack E7 engine Displacement, Bore, Stroke, and Compression Ratio 

Bore
4.875 inches 123.83 mm
Stroke
6.5 inches 165.1 mm
Displacement
728 CID, 12.0 liter
Compression Ratio
up 375 hp = 16.5:1
above 375 hp = 15.3:1
Weight
2210 lb, 1003 kg

Mack E7 engine Power, Torque  

Power
E7-250
250 hp, 186 kW @1950 rpm
E7-350
350 hp, 261 kW @1800 rpm
E7-460
460 hp, 343 kW @1950 rpm
Torque
E7-250
975 lb.ft, 1306 Nm @1200 rpm
E7-350
1277 lb.ft, 1711 Nm @1250 rpm
E7-460
1660 lb.ft, 2224 Nm @1200 rpm



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