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There were basically 2 engines with "flat air flow"
The first was the Type 3 engine
Started life as a 1500 and graduated to 1,600. Found in notch back's, fast back's and square backs.



Next came the VW 411/412, The Type II VW bus and the Porsche Type IV engines. All were very similar with displacements from 1,700 to 2,000 cc's
William, I believe your question went to the shape of the upright fan shroud. The early 36 hp motor used the round shape. Later, VW had the more square shape to the shroud. I don't know what year they changed the shape, but my '60 VW has has the stock 36 hp motor and thus the round shaped shroud. My '67 VW uses the more square shaped shroud. With the 1600 dual port motors, the "dog house" cooler was added to the back side to allow better cooling of the oil.(By back side, I refer to it being between the shroud and the firewall.) I suspect all the motors after 1961, when the 40 hp motor was introduced, used the "square" shaped shroud. The round shrouds that you see used in speedsters is an aftermarket piece available from any VW parts supplier.
Oh, I know . . . just figured that the original question was about low flat fan shroud. With a THING shroud useless in a Speedster 'cause of the air outlet issue,
I thought that this might make a good alternative.

I might go for it myself if nobody else needs it. The extra room at the top would make a high mounted oil breather much easier,
and that's a concern right now due to the stroker crank/high internal pressure currently going on with the engine.

FP

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