G'day,

http://www.ebay.com.au/itm/291809956418?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Comments?

Regards,
Rob M

Rob,

I'm with Ken because this lashup has not been "proven". Ken's setup has, so far. I may have such a thing with purple rockers in my 500 but there's a lot of valve noise at idle, and lack of compression not helped by squirting oil to seal piston rings. The original steel pivoted rockers are short lived, as Ken Henderson has demonstrated twice. It is very tempting to put this on as it might solve the new valve cover dilemma, or doubling up thick gaskets for clearance done by Ken Henderson. I note the low friction rollers, the needle bearings, sounds so high tech. The previous pedestals broke where the stress was concentrated at the junction of the "T" where it makes a right angle. If the stainless pedestals are thicker and do not change cross section abruptly in that area, you "ought" to be good. Editing now after looking more carefully at the ebay ad, it appears that the pedestals are aluminum. If so, the fatigue breaking possibilities are much greater and should be another reason to shy away. End editing.

The needles should slow down wear. Maybe they are bearing on the aluminum alone. Finding someone who uses this system should be your guide. Otherwise, you are the test pilot. The history of these fixes for the 500 goes back to the 1980's or even before when enterprising folks used steel Buick rockers with a shaft, if what I read was correct, and if my memory is also correct. The rockers do look adjustable, and that would make setup easier, but different length pushrods may still be required to begin with.

Note that Ken Henderson. hasn't proven his setup for over 100,000 miles, either. With the mileages these engines have racked up, we may be talking about valve train failures after more than 100,000 on the original pedestal system. JimK says he has had bad luck with original rocker pedestals, even new ones, IIRC.

The problem with just running until it breaks is that if the lifter pops out of the valley, you lose oil pressure immediately.

Carey



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Anyone know the reasoning behind the pedestals - as opposed to a shaft - in the original design?

--johnny

I've heard of others losing the rockers because
the spring clips, which are supposed to keep the rockers on the arms,
failed to do so.

Ken H.