Reply to "FORD RACING ROLLER ROCKERS"

Larry, you purchased some good rockers, I'ved used them on my own Mustangs, and installed them in cars belonging to others, no failures. Ford has sold them for decades. I believe they're actually Crane rocker arms, just anodized blue instead of gold. Anyway, they're billet, not cast, good stuff. These are the rocker arms I am always recommending others to install. Those rockers and their allen head cap screw will easily "clamp" the spring pressures of the springs specified with ANY hydraulic cam, without worry. You see Ford hires these guys called engineers, and they do stuff like specifying bolts. The thinking goes like this: Non-adjustable rocker arms.....hydraulic cams.....lower spring rates....5/16" cap screw. Adjustable rocker arms ... solid lifter cams...higher spring rates...7/16" studs.

There's 2 considerations: the threads of the bolt/stud pulling out of the head, and side forces flexing the bolt/stud. The 5/16" threads have proven over the years they do not pull out of the heads in applications with hydraulic cams. With the mondo spring pressures encountered with some solid cams, yes the 7/16" threads are required. Side forces with the adjustable rocker system are applied directly to the stud, thats why that nice big radius is required at its base. BUT side forces with your rockers are applied to the pedestal, NOT the 5/16" bolt. The pedestal is plenty beefy. All the bolt has to do is keep the assembly clamped together and not pull out of the threaded boss in the head.

The shims mentioned are to raise the rocker arm to achieve correct geometry, they go between the rocker pedestal and the slot in the head. When all is said and done, you may need new push rods, you won't know until your heads are back and mounted on the motor, the rockers are all set for best geometry.

Anyway, the stock rocker arms are junk, and you have purchased the correct replacement.

That's great advice about how to save $70 bucks, very nice of you to share that.