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This is very interesting! So far as I know nobody ever reproduced the T3 Heaterboxes, front or rear. There were different arrangements from year to year and the early ones didnt have the air valve in them but all the ones Ive seen had a steel tube with a cast Al fin around it... straight, not spiral. Anybody else seen a spiral design? These WERE the longer T3 only heaterboxes right? Keith > > I was unaware that the ID on heater boxes was different over the years... > > anyone shed some light on this?? > > These were new HE's with TWO different fin arrangements.One was a spiral > design. > The other was cast, I think.The cast one was much smaller than > stock.Something > to do with the process caused the dimunition in i.d. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~