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Speed Secrets: Gen III 5.7-Liter Hemi Camshaft Swap

Richard Holdener with Speed Secrets teamed up with Comp Cams to take a Gen III 5.7L Hemi and make it go from mild to wild with just a cam swap. For a test engine, the team snagged a 5.7L Hemi from a Ram truck and got to work. With a little machine work they changed the bore and stroke of the engine to increase the displacement from 5.7L to 6.1L.

Forged internals ensures enough strength in the bottom end, and thanks to a valve spring upgrade package from Comp Cams, the 6.1L will be able to take the abuse of running a high lift cam at high RPMs. The team also installed TEA Ported Hemi Heads, a Milodon windage tray, SRT8 exhaust manifolds, a Ram truck intake manifold, and a Fast XFI/XIM ECU.

The mild cam, Comp 260H-13, features a .522/.525 lift, 206/212 duration, and a 113 LSA and made for a square motor. Meaning the peak HP, 455 HP @ 5,600 RPM, and peak torque, 454 Lb-Ft of torque @ 4,500 RPM, were almost identical. That combination would be a good fit for a daily driver or a truck, but for those that want something a little more on the wild side, Richard installed a wild custom grind camshaft.

With a .587 lift, 239/247 duration, and a 114 LSA, you can see there is a huge difference in specs between the two camshafts and with a little trade off in torque, there is just as big of a difference in HP between the two cams as well.

Equipped with the wild custom cam the engine produced 527 HP @ 6,600 RPM and 451 Lb-Ft of torque @ 5,000 RPM. With power gains of almost 90 HP over the wilder of the two cams and only a 40 Lb-Ff loss of low speed torque, this test definitely showed how a simple cam swap can dictate a Hemi’s personality.