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Mopar Engine Performance Guide: Valvetrain May 1, by Mopar DiY At what horsepower and torque level do you need aftermarket roller rockers, pushrods, and valves? When building a hp or greater engine, I recommend upgrading from the stock stamped steel to heavy-duty aluminum roller rockers. The roller rockers provide much more strength, they tend to maintain geometry better, and roller design is more efficient. For a comprehensive guide on this entire subject you can visit this link: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in.

You can copy and paste this link to share: Thus, the aluminum rockers are more suited to these engine setups. In fact, with the higher spring loads the pushrods tend to pierce the stamped rocker arm. The basic upgrade from the stamped rocker is the ductile iron rocker. These rockers are available from Crane and Isky; Crane also offers a 1. However, these are commonly relegated to a race engine. Valves are discussed in Chapter 5 and lifters are covered with the camshaft in Chapter 4.

Pushrods, rocker arms, rocker shafts, pivots, rocker stands, valvesprings, retainers, and keepers are part of the system. You need to select the compatible valvetrain for the hydraulic or mechanical cam for the A- or Magnum engine. Remember, you can use a mechanical valvetrain on a hydraulic cam, but you cannot use a hydraulic valvetrain on a mechanical cam.

The one crossover example is the 6-barrel, which used adjustable rockers on a hydraulic camshaft. Oiling system health is important. Getting oil to the valvetrain is one of the biggest challenges for the oiling system. The valve tip is at the end of the oil path.