how come you guys are not taking into consideration plenum shape? there is a reason that manifolds taper as they go towards the rear. it causes pressure to build up evenly above all the ports, without it the rear runners will see more flow than the front runners. so honestly all of those cylinder designs are not very efficient. they will work, you can make power with them, they are the easiest to build, but not the best design....
this is technically one of the best designs for 4cyl motors
