Cards specifically say “engine”. I would guess took trouble to write engine because his engine in someone else’s car. Normally just write car owner/driver name.
What I find amazing is that all three runs recorded the same exact time of 141.95 MPH. That might be too much of a coincidence.
I'd guess that they wrote more than one or two for the roadster and engine owners and driver and crew.
Chap on Facebook posted a similar slip from 1965 but earlier in the year, he was racing a Vette. He’s active on there today. Wonder if he’s got programmed, pics or memories. https://www.facebook.com/groups/36hpvw.challenge/posts/28247565484888149/
Interesting questions. Can't help in the least, sorry. But I can post something sorta fun although there's absolutely no connection to Clyde Sturdy whatsoever: Specializing In WISSOTA Engines For All Classes Sturdy Engines derives its name from the original name of the parts store and machine shop - Sturdevant Auto Parts. I worked there for a while and several of the guys there are friends. The engine shop built the short block and heads for my current project. We now return you to the originally scheduled thread!
With Sturdy being plural, and engine being the next word, I would think it was his engine in someone else's car also....
I agree that the chance of three consecutive runs being exactly equal is about zero. The plot thickens.
I would say this is very likely, at the end of the regular 1973 season my father and the man he had driving his car had a falling out. A friend of my dad’s had trouble with his engine but want to run some of the big money end of the year races so they put my dad’s engine in Jack’s car and ran, the last few races of the 1973 year.
Years ago I knew of someone whose car always ran eleven seconds flat in the quarter mile no matter how he drove it. He wanted to get into the tens so badly, but to the best of my knowledge, he never did.