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I have never known the FIA remove an homologated item from an historic set of papers. If they have issued the papers because they were satisfied with the criteria when the paperwork was issued they would have no reason to rescind that paperwork!!
Ah, your talking about historic stuff, and I was asking about the British Salloon Car Chanmionship, etc. when the car was current. In those cases it wasn't like you got approval for a car, part, or modification and it lasted for ever, though the rules on how long aproval lasted afer production stopped varied.
And the FIA changed the rules all the time, and lots of items ceased to be approved for that. As I've mentioned, a couple of times, there was a great wadge of parts and modifications that were invalidated in 76 when the 100-off rule went, though there was a let in Appendix J for 1976 for those till 31/12/77. There's stuff in many of Robsons Rally Giants books about the effects of that change on the Celica, Stratos, and RS1800, etc.
Just look at what happened to the Vauxhall Chevette HS in scrutineering at Rally Portugal in 1978 (April I think) for an instance of when the FIA removed approval of parts, not just the Lotus head, but the gearbox and clutch too. IIRC they changed the rules on upgrading to rear disks, making them need homologation on productoin from 78 on - before that the rules explicitly stated they were alowed in Group 2 for the asking. I'd need to check, but I think that's a part the HSR got re-approval for.
There's also, as I said, lots of copies of recognition forms with parts crossed out, I assume by the FIA. Ain't that where their homologation had been removed or lapst or sumert?
But I admit I know nought about historic, and, I guess, I assumed you just have to have a consistent set of mods for a specific period (there's somthing about consistancy in evolutions in some versions of Appendix J at least, but I can't be botherd to go look now) - but if you can mix and match modifications at will in historic, it wouldn't suprise me.
Graham