not believed to be problem the mc16 cases...they had undergone preparation before entering the crankshaft upward ... the air correction plumbing is like a stock mc21 and i use mc21 factory settings in the mc18 carbs except the mc18 Emulsion tubes and main jets...
all i want is the power of a completely stock mc21(45hp) i beleve that i can achieve it with my stuff.
thank you again!