The
351 Cleveland requires separate rocker designs for the intake and exhaust. Here
the 5.5° difference between the two is shown. Big block Chevrolet is roughly
twice these angles, yet most other rocker arm manufacturers re-stamp their Big
Block Chevy rockers for a Ford 351 Part number. Hopefully, you can see that just
because the STUD to VALVE dimensions may be "close" between the Big Block Chevy,
the Ford 460 and the Ford 351 Cleveland, that there's much more to a properly
designed rocker arm that REALLY works, as opposed to just something that lays on
one end of the valve. See:
460 Ford Geometry
