Re: 21A rods set up on a 4" Merc crank
Hank from what I have been told by the fellows who once ran the 21A rods in the old days for their 4 1/8 stroked cranks the rods worked perfectly. My personal experience using 21A rods was also with the Merc crank stroked to 4-1/8 I was burning alcohol in my restored altered. The rods worked fine my sets were also NOS.
Bored and Stroked {Dale} has lots of experience in what I call the modern era using the 21A rods in a Hot Rod flathead Ford engine application. As he wrote above that's the way to go.
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
Last edited by Ronnieroadster; 06-28-2025 at 03:24 PM.
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