The Miller engines are just awesome and look like jewelry. That design later became the famous Drake Offy engines that ran into the early 80's. Drake Offy also worked on a GMC 12 port design for Indy when it was abandon and sold off to a sprint car racer. They also did a front cover to move the distributor to the front to get rid of the spark scatter at high RPM. They also modified some stock heads for sprint cars along with making a side cover and valve cover for the GMC.
But the original 4 cylinder made some HP!!! I was talking to Dan Gurney and he mentioned that in the 70's they had a turbo Offy Indy motor on the dyno when the throttle stuck. So they started to put a load on it to stop it, when the smoke cleared the gauge read 1200 HP!
