• Mopar is responsible for the Hemi engine.engine image by goce risteski from Fotolia.com
  
  Mopar Parts is an automobile parts company that operates under the Chrysler Group LLC. Mopar engines are typically one of Chrysler's high-performing engines, such as the Hemi, but can refer to any Chrysler, Dodge or Plymouth engine. The Chrysler 7.0-L 426ci, 7.2-L 440ci, 6.6-L 400ci and 6.8-L 413ci are all considered to be Mopar engines.
  
  

Intake Manifold Torque Specs

• The intake manifold torque specifications for the 7.0-L 426ci, 7.2-L 440ci, 6.6-L 400ci, and 6.8-L 413ci Mopar engines are the same. The bolts connecting the intake manifold to the cylinder head are tightened to 40 foot-pounds
  
  

Mopar Performance Six-Pack

• The Six-Pack intake manifold's front port is 17.27 inches wide and 1.89 inches tall. Its rear port is 20.12 inches wide and 1.73 inches tall. The intake manifold gives engines peak horsepower of 450 horsepower at 5,900 rpm and peak torque of 459 foot-pounds at 4,000 rpm.
  
  

Mopar Performance M1 Single-Plane

• The M1 Single Plane intake manifold's front port is 16.97 inches wide and 1.73 inches tall. Its rear port is 20.91 inches wide and 1.73 inches tall. The intake manifold gives engines a peak horsepower of 456 at 5,900 rpm, and peak torque of 449 foot-pounds at 3,900 rpm.
  
  

Offenhauser Dual-Port Intake Manifold

• The Dual-Port intake manifold has an 11.2 to 1 air/fuel ratio. Its front port is 15.39 inches wide and 16.38 inches tall. Its rear port is 16.42 inches wide and 17 inches tall. The duel-port gives engines a peak horsepower of 412 at 5,900 rpm, and peak torque of 436 foot-pounds at 3,900 rpm.
  
  

Offenhauser Dual-Quad

• The Dual-Quad intake manifold had an 10.9 to 1 air/fuel ratio. Its front port is 13.03 inches wide and 1.89 inches tall. Its rear port is 16.18 inches wide and 1.73 inches tall. The Dual-Quad give engines a peak horsepower of 424 hp at 5,800 rpm, and peak torque of 431 foot-pounds at 4,000 rpm.
  
  

Weiand Hi-Ram

• The Hi-Ram intake manifold's front port is 41.38 inches wide and 1.89 inches tall. Its rear port is 46.1 inches wide and 1.89 inches tall. The Hi-Ram give engines a peak horsepower of 453 at 5,800 rpm, and peak torque of 455 foot-pounds at 4,200 rpm.
  
  

Holley Street Dominator

• The Street Dominator intake manifold's front port is 12.24 inches wide and 1.65 inches tall. Its rear port is 17.76 inches wide and 1.89 inches tall. The Street Dominator gives engines a peak horsepower of 455 at 5,900 rpm, and peak torque of 449 foot-pounds at 4,000 rpm.