trumpet base bolt sizes

[clive f]

anyone know what the threads/ bolt sizes are that fix the trumpet base to the inlet manifold, I`m working on a project, and don`t want to have to take mine to bits to find out, just trying to save some time, anyone know?

[DaveG]

I think you will find they are 5/16 Whitworth, 2-1/2 ins long (60mm).

[clive f]

thaks Dave.