It is 10'' from the top of the exhaust manifold to the top off the factory breather.
I can put 1 1/2'' on the factory breather and the gravy does not hit the hood.
So I should be good to 11 1/2'' on this modified toy I am building.
and as long as the adapter is no taller them 4'' tall It will fit.
Makes ya go haaaa new engine mount's :-D it could get tight. :-k