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A quick question which may have been addressed before, though I can't find the Forum Thread.
I'm starting the assembly of the motor of my 21F restoration, but am unsure which of the two types of inlet housings, (photos attached) to use: the type with the narrower opening at the top and the casting number DA743 on the side of one of the rocker support arms; or the later type with the wider mouth and the casting number DA743A on the body of the housing.
I think that the former was used up through 1922, and the latter from 1923 when the heavier, conical, inlet valve springs were introduced, but I don't have any documentation, and would be happy to stand corrected. Any advice or info gratefully received as always.
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I'm starting the assembly of the motor of my 21F restoration, but am unsure which of the two types of inlet housings, (photos attached) to use: the type with the narrower opening at the top and the casting number DA743 on the side of one of the rocker support arms; or the later type with the wider mouth and the casting number DA743A on the body of the housing.
I think that the former was used up through 1922, and the latter from 1923 when the heavier, conical, inlet valve springs were introduced, but I don't have any documentation, and would be happy to stand corrected. Any advice or info gratefully received as always.
001 - Copy.jpg002 - Copy.jpg
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