Thanks, Stan -- you convinced me to go through the car engine class rules. But - "V" is the specific designator for Vintage, right? Yet -- while "X" in general says it's a flathead, I see that XO is either a flathead or an inline OHV engine (other specifics, too).
So - I think we're both either cornfused or suffering from drought. Nancy and I just got out of the hot tub - what's your excuse?