Valve cover holes?

[dburgjohn]

The valve covers on my engine have two holes in the passenger side (oil filler and PVC). The drivers side has none. Why does every aftermarket cover I have seen (that says it will fit my car) have two holes in one and one hole in the other? What is the extra hole for? What would I do with it if I purchased the covers?

:confused

 

[rocky]

I believe that's because there are so many different applications for them that the manufaturer is just trying to cover all bases.
rocky

 

[dburgjohn]

That would seem correct, but still what do you do with the extra holes?

 

[rocky]

I'd just go to an auto parts store and get a nice oil cap.

 

[rrubel]

Edelbrock sells plugs for several sizes of those holes.

On some SBC's, like the L98, there's a PCV on one side and the oil cap and breather hose on the other. Non-smog SBCs I've seen have two breathers, one per side - small round things that look a lot like a miniature chromed carb air filter setup.

[RICHR]

 

[Tuna]

If you're thinking about replacing the valve covers on the 1992, be aware that the AC/alternator support bracket may have to be replaced by one for the 93-96 MY.

In 1992, this bracket has just enough curve to clear the 92 valve cover. The 93-96 black covers are about 1/4" taller and require a bracket with more curve. Many after market covers may be taller than the 92 cover (like the 93-96) and require the newer bracket.