Pretty cool, eh? These are about the only type 4 ratio rockers on the market. With needle bearings on the rocker shafts, roller tips and a 1.5 ratio, these should make a nice difference. The lift at the valve will be 0.515". This amount of valve lift would not be possible without ratio rockers because of interference between the connecting rods and cam lobes. Stainless steel valves are fitted with Gene Berg lash caps to protect the tips. The titanium spring retainers are from Crower. Heavy single springs will be used. The maximum RPM will be 6,000 to 6,500. Bolt on valve covers normally connect to the stock 7 mm rocker studs. These rockers use 8 mm studs, so the coupling nuts had to be re-threaded on one side.
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