Excessive Oil usage on 302's

[KurtS]

I've never seen this bulletin before. And note that it's not the normal all-yellow TSB. It does not have the word Dealer in the title either.
http://www.camaros.org/images/doc/TSB_69-T-4.jpg

[rocco376]

Kurt, Have you ever heard of the problem?

[boomer632]

Interesting stuff. I'd like to see visual difference between the two.

[KurtS]

No, never heard of the problem either.

[Kelley W King]

I remember the older smallblocks (pre PCV system) would sludge up the heads and #8 plug would foul out along with smoking and oil comsumption. Had nothing to do with the lifters.

[maroman]

I too would like to see the difference in the lifters. The '55 265's had oil problems but this ain't that.

[Stingr69]

The Chevy Power Manual has pictures of these lifters. The standard solid lifter was the "piddle valve" and it has a hole for oil feed in the machined down waist area (typical of the hydraulic and sold flat tappet lifters you see today). The "Edge Orifice" reduced oil feed solid lifters have the oil feed hole on the large diameter of the lifter body so it gets a lot less oil feed.

The Power Manual also shows the "Mushroom" solid lifter which has a larger foot that rides on the lobe and must be installed in the block from the bottom of the lifter bore.  The mushroom lifter can move the valve faster due to the larger foot at the cam. More agressive cam profiles are possible.