I just installed an Edgy Head so I can not measure the stroke thru the head. I tried to measure the stroke from the pan side several times getting a different measurment each time, if I had that third hand we sometimes need I might have gotten a good measurment. Anyway, it's no matter if it's stroked or not I just love my Flathead. The block also has the water pump bypass for the head which tells me it's newer than 48 also. I used the older waterpump type since that was what I have. I think a Block was purchased and installed sometime in the 50s, it has been rebuilt only once since , it has an overbore of .020 on the pistons. This engine runs stronger than the one I had in my 51 truck, and now with the new head and dual carbs it should be even better. When my Winter workings are finished I intend to post pics of my car, I'm pretty proud of my 48 coupe and want to show her off. until then. Keep em running. Flatheadjim