There is an exhaust Air Check Valve that goes from the bottom of the air cleaner to the rear of the right exhaust manifold.
The 440 will be getting a throttle body EFI system.
Is there something to block that port on the exhaust manifold off?
Also, Would I be better off getting exhaust manifolds from an earlier model. If so which model should I be looking for.
I am replacing the entire eshaust.
