The original 45" setting was mandated for 5 minutes, to me that is WEP.
doesn't matter if that is what you think, that is not the way it was. Many engines had military rating, some never got a WEP rating.
Now please note that not nations rated their engines the same and not all nations test their engines the same.
for instance in 1939 the US required an engine to pass a 150 hour test while the British wanted 153 hours and the French wanted 113.5 hours.
However the US wanted 10 hours at take-off power (which was sometimes the same as military but not always) while the British were satisfied with 9 hours and the French with 3 hours.
The US wanted 50 hours at the "rated" power (max continuous which for an Allison was 1000hp) the British wanted 42 hours and the French wanted 10 hours. there were sometimes requirements for running the engine at an overspeed setting (but not necessarily making more power) to make sure the engine didn't destroy itself in a dive with the propeller overspeeding the engine and the rest of the hours were spent at 70-90% of the "rated" power.
The take-off power (or military) was done several ways and was often up to manufacturer, at least in the US. Usually it was done in 5 minute increments with a cooling off period between each 5 minute segment (might be 3 minutes of some engines) . The cooling off was done at cruise (70-90% of rated) power. Sometimes the manufacturer could request longer periods of time at the high power settings. It was bit of a gamble. If the engine broke during this government test it was up to the manufacturer to fix it and the test would be delayed during repairs.
Obviously air cooled engines might want to take advantage of any cooling breaks they could get.
US WEP ratings as they came about in 1942 called for a test engine to complete 7 1/2 hours at the desired WEP rating done in 5 minute intervals with appropriate cooling off periods (running at cruise). Obviously this built in a fairly good safety margin but it assured that the worst engine out of a production batch of hundreds would probably stand up to the WEP rating in service (only one engine had to pass the test).
I don't know if the US changed the testing procedure at a later date. I have seen engine charts that give 15 minute time limit to military power and 5 minutes to WEP.
Now please note that the Military rating didn't exist in the US until after the start of WW II in Europe. One many early war engines the Military power was the same RPM and manifold pressure used for take-off (but not always).
Some of the early export aircraft were fitted with commercial engines and these engines were often called by their max continuous rating. AS in an 850hp Wright Cyclone (which was good for 1000hp for take off)
The British and Americans didn't rate their engines quite the same and it's gets more complicated the more countries you try to bring into the mix.
US engines were rated at max continuous (rated power) for either 0ne hour or until the fuel ran out (joking, but some engines had no time limit on max continuous) the US had no climb rating, it was either military/take-off or max continuous. the British had a 30 minute rating for climb and then a max cruise or max rich cruise.
and once again you have to consider the fuel. The -33 Allison (and the -39) were originally designed and tested using US 100 octane fuel which had no rich rating it was 100/100 in theory but in practice it could vary from 100/97 to 100/105 or so. Not kidding, a few batches were later tested and found to be under 100 when running rich. fuel testing was done only at lean mixture at this time. The performance number scale and ways to measure rich mixture response only came into being in either late 1940 or early 1941?
The British knew they could use more boost with their fuel than with using US fuel but they didn't really know how much more since they couldn't measure the fuel differences from batch to batch or specify the actual response they wanted from the manufacturers. BoB fuel varied from around 100/115 to around 100/120.
Long winded way of saying until you had 100/125 or 100/130 fuel you had about zero chance of rating an engine using high boost for WEP. You could run an Allison -33 or -39 at full military power on US 100/100 octane fuel.
