340 intake on a 318?

That's been my point all along. The question everyone is asking is what effect does it have? The benefits might be a better mix.....maybe even better mileage because of that. The flow definitely has to be affected in some ways. Maybe unnoticeable in most applications. I would think high RPM would be affected the most. Depending on all the rest of the components, other areas might see a change also...either good or bad. Why not get the part that it's designed to have. You have to ask yourself, why do the manufacturers (both factory and aftermarket) make both types of manifolds if it doesn't matter?