The V8 Owners Forum -

Are 4.0L tvr exhaust ports larger than SD1 ports as the manifold flanges look significantly bigger?
I don't want to strip my TVR manifolds off yet and check them against my TT manifolds as I can't get at them in the car!!!!

In the absence of wiser replies, I *think* so - used to get TVR exhaust gaskets for my ported 3.9 cos they were bigger than the std ones.

I'll hopefully strip it later then I can let you know )

Quick update, the ports are the same size it's just the gaskets and manifolds that are condierably bigger. It's almost as if it's been done for looks!!!!