Wouldn’t that mean the the left restrictor passage should then be smaller than the right? Or is the flow difference irrelevant as long as the lubrication is adequate and the rockers aren’t flooded?



6 VOLTS/POS. GRD. NW INDIANA

As long as the overall oil pressure is not being affected, then any excess amount of flow to the top end would be considered irreverent.  Always better to have an excess rather than not enough.

While I have considered using 0.062” restrictors in the left bank rockers to reduce the oil flow further just for that bank, I have not experienced any valve cover oil leaks as a result of the difference in oil flow between the two banks.  What I did not mention earlier was that the right bank would also eventually overflow if I had continued to prelube the engine.  It must be kept in mind that the engine prelubing is being performed with cold or ambient temperature oil and that cooler oil does not flow as easily as warmed up oil thus overflowing the valve cover rails more easily when the valve covers are not on the engine.  Because the oil pressure for the engines with the 0.078” restrictors has been good, I continue to use the same restrictor sizing for both banks.

Lorena, Texas (South of Waco)

I just had another look at the Engine. The Left bank is fine as far as seepage. there is none. The right side has Oil all along the lower edge below the Rocker Cover. Maybe worth just restricting that side with .062 restrictor? I don't know what else to try. Tee-Bird Covers and the Rail etc is as stock. No mods at al. I have tightened down the Covers several Times. Still seeping. I assume it is leaking when being driven and after sitting when parked there is Oil on the Floor on right side only. Pan is dry, rear main Seal Dry. Oil Pump Dry.. Has to be the Rocker Cover with excess Oil not draining quickly enough. Maybe just restrict the One side and see what that does? Just a reminder this Engine is a new rebuild. Completely clean inside so there should be no reason for Oil not to drain from heads other than may be more Oil than Drain at rear can handle. I had my machinist cut the Oil Groove in Cam to .035 and installed the Cam Bearing with outside Groove.

  

What would be nice (IMO) (also $$$) is to have a pair of clear acrylic rocker covers fashioned to see exactly what is happening.

It seems (to me) much of this style modification is guess work.

If the head has umbrella type valve seals, flooding may cause cylinder fouling(?) ...

And the longer return oil stays on the cylinder head instead of hitting the pan(?) ...

I still think the drain tubes (and possibly the older valve seal shields) should be retained in some fashion with the restrictions.

There should be a system calibration for a street engine, mild street and race?

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6 VOLTS/POS. GRD. NW INDIANA

I have a clean set of steel Y-Block valve covers I had planed to cut the tops off and cover with taped-on clear plastic, but likely won’t bother as probably overkill, since I’ve never had a problem with leaking covers before ...

Now that is a good suggestion.

It is not the question of leaking rocker cover(s) but the quantity of oil up top and how quickly it takes to drain back to the pan, especially with umbrella type valve seals.

And it is also going to differ if the engine is street, hot street or race.

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