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Brian, the 1600cc Kent engine (pushrod four, also used for decades in Formula Ford racing) that Goodman built had pistons with less dish to get the high compression, and had a "burn slot" in the head, a little like one of Singh's grooves. The Kent head is more or less chamberless, being basically flat and using the dished piston as the combustion area. I believe this is termed a Heron head, and have heard it is also found on the V-12 Jaguar.
The Ford Fiesta that was sold in the USA from 1978-80 (which Brit Fiesta enthusiasts call the Mk1), got rather good fuel economy even in factory trim and lacking an overdrive gear, getting an EPA-rated 46mpg, highway. Dandy engine, pretty good car, crappy brakes, . . . but improvable, like everything else.
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