Yeah. Not wanting to get back into non C4 engines lets just say that a four cylinder engine from the low priced three and not a Chevy or F car that I ran was a flathead. I wanted an OHV engine and had been told that a F car Y block head would fit pretty good. But not great. And they are not the best of the best heads. Still I tried it. the small blue car on the left went a best of 113 mph with the flathead version of this off brand engine. With the Y block head it went 135 mph. All internal parts the same. So going OHV should be some improvement.