Originally Posted by
Maximo
6.5 insert and a 41021 manifold...no wonder you have no top end..... swap the manifold to a 41001 or a 41033..then go to a 8 mm inserts, as well remove the brass shim from under the button...will be like a whole new engine
Thanks also I know fuel milage depends a lot on throttle finger but with the 8 mm venturi won't that hinder fuel milage as well? what other pipe could i try with that manifold ?