Re: 49-53 mercury rods
With that 1.999 diameter rod journal that's the size for the early cranks. Latter cranks 1949 to 1953 rod journals were ground to that 1.999 size when the stroke was increased from stock. To determine if your have the early or late crank first thing to answer is how many oil holes do you see on the rod journals. If its one then you have an early crank which needs floater 21A rods and double wide floater rod bearings. If you see two oil holes you have a latter crank that's been ground down with an increased stroke. The rods you need would be those used on the early cranks 21A and the wide floater bearings.
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
First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921
First Ford flathead roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH reset the record in 2024 to 211.830 running to mile four. Top speed 2024 mile five 220.672 exit speed 221.587
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