Re: Sonic tests back-Too thin for 3 5/16 ?
Your going to fine with the 3-5/16 bore seeing the sonic test wall thickness. If the shop your using will not do the boring I would look for another shop to do what you want.
For piece of mind we ran a top speed of 219.8 MPH last year at Speedweek with a block bored to 3-5/16 with similar measurements as yours and that was after seeing two records over 200 MPH all together 16 miles of all out abuse much harder than anything your ever going to do. That engine will be running again this year at Speedweek.
Ronnieroadster.
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I use the F word a lot no not that word these words Flathead , Focus and Finish.
"Life Member of the Bonneville 200 MPH Club using a Ford Flathead block"
Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline.
First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH
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