Posted by dhermesc on October 23, 2012 at 09:29:14 from (24.248.193.103):
In Reply to: What gives? posted by Notjustair on October 22, 2012 at 19:04:35:
While it might be over rated to a degree the same displacement with overhead valves should be more powerful than a flathead. That's why no one uses the flathead design on anything anymore.
IH switched to overhead valves on nearly all their engines back in the 1930s, Chevy switched to OHV in the late 1930s, Ford hung onto their flathead design until the early 1950s, finally dropping it in 1953. Small engines hung on to the design longer because the design was simple and rugged - but eventually they needed to "update" due to EPA demands.
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