SOHC V6es are entirely feasible but the extra cost associated with the engineering often didn't warrant it. Most domestic V6es and a lot of import V6es were pushrod till the last 15 years or so. Most applications simply didn't warrant re-engineering what worked already, hence the reason pushrod V8s are still in production and widespread use. Ford's mod-motor (the 4.6 sohc v8) that's been in the Mustang, and a few other things since the late 90s is pretty much the only widespread OHC v8 used domestically. They also have a DOHC version that goes in the Cobras.
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