Re: Eab
It wasn't considered as being as necessary by 1951 due to the better fuels available at the time. The rotator valves that were introduced that year would give more even seat wear so they eliminated the intake inserts and even exhaust inserts for car engines produced late in the flathead era. Trucks kept them for the exhaust valves through the end of production. Both of my early 1951 Mercs had no rotators yet and still had the seat inserts so it was begun mid year sometime for the 51 models.
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