Join Date: May 2009
Location: Bonney Lake, WA
Re: 390 Valve covers
Sorry for the confusion, let me see if I can explain it better. In the early 60's the intake manifold had the oil fill tube in the front and the pcv/road draft tube in the rear of the intake manifold. The oil fill tube had a cap that was a breather. With this type of intake manifold, the valve covers had no holes in them because they didn't need holes for anything. They use the baldy valve covers with no holes.
In the later 60's both the oil fill and the pcv valve was moved to the valve covers and the intake manifold no longer had the oil fill and pcv valve on it. On this style, one valve cover has the breather that can be removed to add oil and the other valve cover has the hole for the pcv valve.
If you use the early valve covers (no holes) with the later intake manifold (no breather/pcv) then you will have no way to add oil or use the pcv system.
If you use later valve covers (holes) with the early intake manifold (holes) you will just have extra holes in the covers that can be filled with breather caps.
Here is a picture of a early style set-up. The breather/oil fill is in the front of the intake just behind the radiator expansion tank and the pcv valve is on the back of the intake manifold (can't see in this picture). The engine has the baldy style valve covers with no holes since they didn't need holes for the breather or pcv because they are in the intake manifold.
Hope this clears it up a little.
I don't know why, but I can't attach a picture to this post. I will try to get the picture to post
1964 Galaxie 500XL, 352cid, Cruise-o-matic, 9in rear, white w/white interior, all original american iron as it came from the factory.
1992 F150, 5.0L, E4OD, 8.8in rear
Last edited by r.n.r.racing; 06-10-2013 at 10:58 AM.