Vortec 7.4 Engine Problems, MPG, Oil Capacity/Type

The Chevy Vortec 7400 is a 7.4L 454 cu in big block engine made from 1996 to 2001.

It has had some problems like:

  • Overheating
  • Backfiring
  • Knocking
  • Vibrating
  • Fuel Pump fails
  • Not starting
  • Stalling
  • Steaming


Gas Mileage is 10 mpg city and 14 on hwy.


The engine uses 6.7 qts of 10W-30 or 5W-30 oil.

torque the drain plug 21 ft/lbs



290 horsepower at 4,000 rpm.
410 torque at 3,200 rpm.
bore and stroke of 4.24 inches x 3.99 inches.
valve train has an overhead valve, ohv, with two valves per cylinder.
multi-port fuel injection for induction of fuel.


Compare to Vortec 8100