the intake valves for the cylinders that share the ports open several degrees of crankshaft rotation apart
At the 1-2 and 5-6 ports the intake valve opening interval is alternately 240° - 480° - 240" for 1 pair, and 480° - 240" - 480° for the other pair.
I'm sure it can be done, but IDT such a product is available currently.
