In theory 59-62 use the rocker arms themselves as a restriction.I believe this was done to prevent the oil feed restriction used previously from getting plugged with goo...When in doubt you can do what I have done several times.Take a .062 Holley carb jet and hand grind or file it so it's a light press fit in the rocker shaft oil feed tube..062 is the same restriction used in the rocker oil feed tube on 228-302 GMC's ....


70 Triumph 650 cc ECTA current record holder