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Can anyone help decode my engine please? I believe it to be a 230 ci or 250 ci. The number on the lower middle block are 2850817, GM 12 X is stamped on the lower middle of the block CON 2 at the back, H163 above the dipstick and F0829B is the serial # on the plate above the dipstick. The head casting is 4435F18 on the front passenger, 7880 in the middle and 8062 on the drivers side behind the manifold. Many thanks.
 

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F0829B = Flint, built Aug 29th. Not sure on the B, most Nova codes are two letters and depend on the year of the engine. More info here, http://novaresource.org/codes.htm
 

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Can anyone help decode my engine please? I believe it to be a 230 ci or 250 ci. The number on the lower middle block are 2850817, GM 12 X is stamped on the lower middle of the block CON 2 at the back, H163 above the dipstick and F0829B is the serial # on the plate above the dipstick. The head casting is 4435F18 on the front passenger, 7880 in the middle and 8062 on the drivers side behind the manifold. Many thanks.
The casting number you gave (2850817) doesn't exist. It's probably 3850817 which is a 1962-78 230/250 block.

Casting date (H163):
H = month; August
16 = day; 16th
3 = year; 1963

Assembly code (F0829B):
F = assembly plant; Flint Mi
0829 = assembly date; August 29th
B = application code; 230 with Powerglide from a 1963 full sized Chevy
 
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