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I am no expert and have forgotten much I once knew. Corrections invited. I think both VAH & VAC take the same engine, there were some internal & block attachment changes to later 40's engines mostly during 1949 & up that I don't think make any difference in a swap. Assuming original the '48 has a round cover on the timing cover for access to the governor & flyweight balls. Later VA engines had flyweights riveted to the cam gear, no access cover on the timing cover. VA engine serial nrs are stamped into the block above the starter. '48 s/n should be stamped horizontally just below the cylinder head gasket. Should be 3 letters + 124 + 5 digits, eggs ample VAB 124 12345, where VAB is chronological (after VAA 124, before VAC 124)but not model year specific due to overlap and mix. 5 digits are s/n for that one engine. Later VA engines serial nrs were A47 + 5 digits ('49,'50,'51???) Again lots of overlap and mix. ~'52 through end of production serial nrs are stamped vertically lower down (behind oil filter or plate) 2 digits + letter + 5 digits, I.E. my '53 is 72-G-05214. I have seen '53 and later also starting with 73 + letter + 5 digits. Look below the dipstick for the block casting nr 328A and on the cylinder head for casting nr 148 (gas) or 159 (low cost fuel). Early timing cover before s/n A47 w/gov access cover casting nr 122, s/n A47 & after w/o access cover 334. Joe
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