Yesterday I went to check out a buddys complaint of noise from his 64 TBolt clones 427 Hi Riser engine. It has a moderate Bullet solid flat tappet cam , specs call for .018" lash, a quick check revealed several at well over .035", so I went ahead and reset them all, but I was suprised at how much slop was in the rockers, where they fit onto the shafts. You could noticeably twist the rocker arms on the shafts, as if the holes in the rocker arms was either severely oversized or possibly egg shaped. This engine has only seen limited street use, and he has reciepts for the rocker setup being new when the engine was assembled. The rocker setup is a Dove/ Comp Cams package, with the end supports that bolt down into special head bolts, similar to what my 427 has. My rocker arms are blue, with no logo, and really small Allen head adjusting screws, these ones have the Comp Cams logo, and have larger Allen head sizes, later design maybe? My rocker arms fit nicely onto the shafts, over 1/2 of his are very loose and sloppy. Suprisedly, I found no signs of aluminum shavings or debris in the bottom of the heads, I recommended to him cut his oil filter apart and inspect it for debris inside. Has anybody else had similar issues with Dove rocker arms? I know that the Hi Riser rocker stands are shorter than other FE engines, but are the rockers themselves any different? Do Doves use the standard shaft dimensions as factory Ford stuff? I told him if it was me, I would keep the Dove support setup, and replace the rockers with OE Ford, Isky or Crane iron rocker arms, but I am not sure if those would be compatible with the Dove shafts, and Hi Riser heads, as I have no previous experiance with Hi Riser stuff. I was kinda suprised that despite the sloppy rocker arms, the engine still had 75-80 psi of oil pressure cruising at 2500 RPM. Other than hi $$$$ TRD or Jessel stuff, what other rocker setups are available for the Hi Riser heads?