Re: Boring a flathead
As a side note, when Ford moved the valves farther away from the cylinders in 1946 to alleviate cracking between the valve seat and cylinder, they elected to go cheap and did not change the indexing on the cam.
The technical explanation for this is long and involved but the basic reason was tooling cost because they knew there were going to be major changes to the engine in 1949.
The cams from 1946 to 1948 were ground on the same index as the 1942 and earlier ones.
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