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In N America, there were Djet E heads as well as Djet F heads. Kjet heads were also called "F," though they weren't necessarily identical.
So - '70 and '71 fuel injected Volvos were those with B20E engines and all the holes for the Djet goodies. Early B20F ('72 and '73) also had these Djet accommodating holes. '74 and '75 B20F heads didn't use Djet but did have the injector holes drilled because they ran Kjet.
In Canada, carbs were available long after they'd been discontinued in the US. There were a number of heads that were identical to the US spec F heads except that they hadn't been drilled for the injectors (or any other injection stuff). In the US, we call these the "Canadian B" heads. Carb fitted but with the larger valves that the US only received in injected heads.
Best,
Cameron
Rose City
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