I can see that the Hesco/Mopar rockers have a few more internal parts, so a slight bump in price over the HS rockers would be in order.
While the head's off, one might as well go whole hog and do other mods besides just having the stud bosses shaved 0.4". Just to remove the head and have it machined so that the HS rockers will fit involves a considerable amount of time.
Maybe I'm stating the obvious here, but it seems these companies price their respective sets of roller rockers according to the labor and expense of installing them, and not necessarily to compete solely on price of the rockers themselves.įor example, Summit Racing lists the Harland Sharp rockers for $285.39, yet it's about a grand to do the complete run of mods listed on Harland Sharp's website. The Proform RR's cost just $169 so if they do work, it'll be a hell of a cost saving.
The only issues are the length of the rockers and whether they'll fit under the stock valve cover. They also use 5/16" bolts so the head won't need to be machined, and they come as pedestal mount which makes it easy. I'm gonna find out if the Mustang 5.0 RR's will be compatible for the Jeep 4.0/stroker. Won't that compromise the function of the PCV system?īy the time you've bought the HS rockers, added all the other bits, and done the machine work, the cost will exceed the $440 price of the Yella Terra YT6627's which bolt straight on under the stock valve cover without any modifications needed. Internal valvecover PCV baffles must be removed Not exactly a bolt-on job, and that also adds to the cost. That's a little bit more than minimal machining and it can only be done properly if the head is removed.
The following machining operations are required to install the rocker arms:ĭrill and tap stud holes deeper (to match studs) and chamfer I priced out almost everything listed in the write-up below and it came out to around $400, not bad considering you don't need the spacer, machining is minimal, and that included the valve springs, retainers, etc.