Thanks both.
Sorry for the slow reply, I've tried to say thanks loads of times but it never seems to get published.
Is there a formal route if I have a questions regarding a HTP/homologation/spec? When I ask our ASN they more or less refer you to the regs and say it'd be up to the FIA to decide.
I'm looking at the papers for a C3 Corvette, 583 and there is no date on extension 4
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