STANDARD SINGLE exhaust size?? Trivial question.

[Innuendo]

I'll double check when close to info but I think at least the dual system engine pipes were 2", and stepped down at the mufflers. The original cars I've looked at looked to be the same size pipes onto the manifolds as my Prem.

I'm referencing the tailpipes. Which is what Agro and his mate are betting over.

2" is 100% correct for HZ but I'll stick with the tailpipes on LH/HQ/HJ Holden V8 being somewhat smaller than 2" and likely 1 3/4" or 1 7/8" as I remember them looking really silly and thin.