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Need Cont'l Engine Book Help Re' "N", "NA", "N-NA" Engine Confusion 1915-25

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Old 11-06-2015, 04:04:38 PM
Bud Tierney Bud Tierney is offline
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Default Need Cont'l Engine Book Help Re' "N", "NA", "N-NA" Engine Confusion 1915-25

I noted who had the Cont'l engine book, but apparently lost note...
My parts catalogs are a mess re' the "N" and "NA" engines...
(1) A 1917 ring catalog lists the "N" in two bores, 31/2 and 33/4 (not the problem---the 33/4 seems to've been the the most popular version)...but not the "NA"...
(2) a good 1924 piston catalog lists many makes with the "NA", all 33/4 bore, NONE with the "N"...
(3) a good 1930 gasket catalog lists many makes with the "N", NONE with the "NA"---many makes (if not all) being the same makes/models shown with the "NA" in the 1924 catalog...
(4) that 1930 catalog has a Cont'l engine section, showing only the "N", listed with both bores---no mention of an "NA", despite the listings in the 1924 catalog...
(5) other catalogs show some makes with "N 33/4" and others with "NA 33/4"...
(6) a few listings appear as "N-NA 33/4"...(option? succession? another variation?)...
(7) the last straw---a 1930 valve catalog lists THREE valves, with differing specs, their then:
(a) #96, for various Cont'l 6 cyl AND "N 31/2"...
(b) #51 for "N33/4"...
(c) #369 for "N-NA" (not N, NA, as if two separate engines/variations, but as if "N-NA" was a variation of it's own??)---no years shown in this catalog...
(8) a later catalog, 1936, lists valves for the "N 31/2"" and "N 33/4", with no mention of any valve change, but no listing for any "NA" or "N-NA"...
So the question is---does the Cont'l book say anything about this "N" and/or "NA", "N-NA" confusion???
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