Hi guys this is Tracy G up in Reno Nevada. I was just under the hood of my '85 Subaru GL wagon, 1.8L 4cyl ohc w/ a 2 bbl feedback carb. I have no pics yet and have not pulled the carb, BUT, it looks like the throttle body section is thin, possibly too thin to fit a groove under the primary butterfly. Also the throttle body is made of iron. I was imagining having a spacer plate made (aluminum?) to extend the throttle bores enough to fit a groove-maybe epoxy the throttle body and the spacer together put bolts/nuts thru the stud holes bolt together till epoxy sets well. There is a thin (maybe 1/8 inch) black plastic heat isolater spacer under the carb now (factory stock). Not having the carb off yet I guess that much material may allow room for a groove. Also I'm concerned about grooving in iron, I wonder that a bit may get used up or dulled badly working in iron. If I did get a spacer made or even tried grooving w/the iron and plastic together there would be a difference in material hardness going on, and again I wonder if that would be weird to work on. I found a donor car at Pick-n-pull w/ same carb so I could get that and do grooving on it then switch throttle bodies. Has anyone tried this idea on a carb w/ a thin throttle body (i.e. Quadrajet, Thermoquad, foreign. etc.?) The only other idea I can think of is to switch to a Weber carb and groove it-- but car is computer control feedback carb equipped and we do smog tests here; I would talk to the State Emissions control lab folks first, as the computer and LOTS of things would go Deep Six that route, and getting an OK for that might be like getting a permit to have a Watch Crocodile chained up in an unfenced yard a block from an Elementary School!! If you have suffered this far reading this you have realized I have not done my first Groove yet. Anyway sorry for the long twisted post here, but that is what I think is going on w/ my Subie!! Thanks for reading, TracyG