Thanks RowdyRay....i had to do exactly that to my older HPI 18 engine which I am replacing. But I don't want to take the manifold off that one as I can use the whole setup in a nother car (that way each of my children will have one). It was a bit of trouble to make it fit so i'd rather buy a new manifold (the right one) to fit on this OS engine (which everyone is telling me is an absolute rocket!
Isn't there a matched manifold by OS? OS suggest a manifold in their engine manual but I can't find it anywhere.
I don't mind doing a bit of DIY to fit it - so any 15 size manifold will fit? Can you suggest one in particular? Thanks for getting back.