Originally posted by turbopackman
Anyone ever heard of Hudson 7x racing engines? Ever tried to apply the valve reliefs to other flattties?
Hmmmm. What are the odds? Another flathead guy from Solomon!

Relieving is an age old flathead hop up trick. Even the Beach Boys immortalized it: "......she was ported and relieved and she's stroked and bored.....".

And the 7X (early '50's NASCAR championship material) might look something like this.