Easy twin plenum question

[The AJP Griff]

Hi all,would love to know what the std size of the throttles are on the V8 twin plenum,and what they can be taken out to?Also what was the std size of the trumpets inside?Many thanks,Mike.

[RR Cerbera]

The original SD1 twin plenum used the same throttle discs as the single plenum cars. As I now longer have my car (*sob*) I can't answer the other questions I'm afraid, although I do know that the trumpets were a slightly larger diameter and machined down into the inlet manifold.