Last time we had Project 505 on the dyno was for the September 2007 issue of Mopar Muscle when we were testing the new Holley Ultra HP carbs. During that test session, we saw 738 horsepower from the ...

Last time we had Project 505 on the dyno was the June 2010 issue of Mopar Muscle when we modified our Indy EZ heads for Jesel rocker arms. During that round of dyno testing we saw a peak of 805 ...

Shaft-mounted rocker arms are usually reserved for the high-stress environment of an all-out racing engine-whether it's for drag racing or some other competitive motorsport. Most of us late-model ...

If the LS1/LS2/LS6 engine family has a shortcoming, it has to be the rocker arm mounting, which doesn't allow for adjustment. Non-adjustable rockers have become standard in virtually all late-model ...