Truthfully, the tunnel ram does work well when tuned to a lower compression engine. They called it the long ram, and it was a tunnel ram, with about 6" more runner length, and flattened so it fit under a hood. The problem is keeping the mix in suspension for that length, and utilizing the inherant pressure wasves generated by the intake valve opening and closing to get the "ram" effect. If the cam is a little off, the presure waves may hinder things, which is what most low compression tunnel ram engines run into. Run smaller carb(s) and a smaller cam, and tunnel rams work very well. Usually guys over carb them, and that kills the velocity, and the power down low.