Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Oil drippers were used in certain Pontiac V8's through the late '60's up through '72 models. Of note, certain application (engine codes) did not get the bolt in drippers. As an example, even late '60's 350 2bbls, typically had the bolt in drippers, but by the '71 Pontiac models, only the 400 4bbl engines and the 455 HO engines had them. Engines like the '71 455 Dport, code YC, no drippers.
In the mid '70's Pontiac V8's, one will begin to run across spot welded in (integral ) oil drippers in many Pontiac valve covers (Chevy began doing this w their BBC valve covers in the mid 60's). Going through nice undented used '67 and later Pontiac valve covers to cull out nice ones to paint ('71-72) or to send to the plater, the later integral drippers style valve covers, when refinished, will lack the smooth finish, nearly each of the spot weld points will be visible.
In two of my 455 HO builds, run stock steel rockers as a matter of the rules and as a matter of choice. have dynoed & there was nothing to be gained with going to stamped steel 1.5 roller tips. Many others who are not limited like I am in valve lift, have run the cheap Comp roller tips with much more aggressive ramp speed and higher lift cams/stiffer springs and many have noted valve train noise directly related to the stamped roller tip rockers. In my 451 build, with much more valve spring pressure, duration and lift than the PureStock builds, went straight to a set of stainless Crower roller lifters.