SMF - Just Installed!
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I have had all kinds of FE/FT bus engines apart and never seen one of these. http://pages.ebay.com/motors/link/?nav=item.view&id=221910215113&alt=web
I seem to remember that was a fix for Y-Blocks, due to crummy non-detergent oil and marginal oil feeds to the rocker shafts. I've never heard of FE's needing such a thing. It's usually the opposite problem!