Rocker assembly question

[Gene Fiore]

I am in the process of doing a head swap and will be replacing the stock non-adjustable rocker assembly with a stock adjustable rocker assembly. The adjustable assembly I have has a unique #1 pedestal that has an oval shaped top with a special washer. It looks like some kind of oil return hole or something. The non-adjustable set has no such #1 pedastal. They are all the same. Can I install this assembly on my head without any worries?

 

[CZLN6]

Howdy Gene:

Yes, they are interchangeable.

Adios, David

 

[Gene Fiore]

Thanks David! What is the purpose of that unique pedestal?

 

[wsa111]

Gene, the front pedestal oil bleed supplies extra oil to the distributor & camshaft gears.
It also slightly lowers oil pressure which will ease some load on the dizzy gear. Bill

 

[CZLN6]

Howdy back:

I cannot verify, for sure, the purpose of the vented staunchion. I've heard various explanations, but cannot verify any.

The most common explanation is that the early type is a pressure bleed. Someone here reported that by replacing the old style with a new style you can increase flow to the rockers. I do know that the early and late staunchions are interchangeable. The back one is the critical one that passes oil from the head to the shaft through the back head bolt. IF you've milled your head, be sure to re-establish the transfer trench in the head. If you're using a thicker, composite head gasket that helps maintain the transfer slot.

It is also a good idea to-
* use the waisted head bolt on the back/transfer head bolt.
* give the inside of the rocker shaft and the rocker arm oil holes a good cleaning- if you haven't already.

Adios, David

 

[Crosley]

Same question I had a while back..

what I did was take the adjustable arms and the later shaft and stands to assemble the rocker shaft for my 200 cid motor.

The early shaft with the pressure bleed off stand had more wear on the shaft than the non adjustable shaft did..

8)

 

[addo]

"The older one was more worn than the newer one".

Makes sense to me, more or less.