https://automotiveamerican.com › 2021 › 08 › 10 › whats-an-ardun-the-ultimate-ohv-conversion-for-the-ford-flathead-v-8-mike-herman-of-hh-flatheads-torqtalk
What's an ARDUN? The Ultimate OHV Conversion for the Ford Flathead V-8 ...
Interestingly, the Ardun had short intake rockers and long exhaust rockers and was similar to the 1951 Chrysler Hemi but preceded it by four years when it was introduced in 1947. ... However, the heads produced between 25- and 60-percent more power depending on tuning—the original had but a single
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Took me a while to figure out that other was an F-head layout. The only F-heads that I remember with the exhaust valves on the head were some Moto Guzzi engines, while all others had the intake over exhaust.