Roller Rockers in Stock

[Jeff Lee]

Speaking for the few AMC racers out there, all applications use a stamped steel rocker arm over a ball / stud assembly with no guide plates (prior to last week). Looks just like a SBC arrangement but the rocker folcrum cenerline to tip is about .200" longer and offer's a 1.55 ratio (my testing found 1.53 typical). AMC uses a 5/16" pushrod and a 3/8" screw-in stud. Upgrades can be made to a 3/8" pushrod and a 7/16" rocker stud from a BBC. Bracket racers typically use a modified Pontiac guide plate if neccessary.

As stated by SSDiv6 ..."Chevy and Pontiac have a great selection of rocker arm options"
Yes, especially Pontiacs. I suspect a Pontiac racer or two might not like everybody else having roller rockers because that opens up the door to everybody having the same ratio's available. I'm not personally aware of any conclusive evidence that shows a 1.65 rocker ratio has a decided advantage over a 1.5 rocker ratio (both theroretical ratio's) in a Stocker application (both offering the same gross valve lift) but I would suspect there is some advantage although miniscule. Personally, I always built a cam around the rocker ratio.