L79 engine differences: 66-67 Nova

[Material_Boy]

Rob,

To add to what 69L78Nova replied, yes, the 66 was rated at 350 HP and the 67 was rated at 325.
Both engines internally were the same, IE, they both shared the #151 cam and both were 11-1 compression.
Other differences:
66 L79 came with the 490 aluminum intake. 67 had a cast iron intake.
66 came with a 3245 Holley carb. 67 had a Quadrajet.
66 had the chrome opposing snorkle air cleaner. 67 had an open element with chrome lid.
66 came with a 12 bolt rear. I have been told the 67 came with a 10 bolt but I am not sure if this is the case.
The optional 4 speed in a 66 was a Muncie. I have been told the 4 speed in a 67 was a Saginaw, but again I am not sure if this is the case.
For some strange reason the handful of 67 L-79's that were built were built late in the model year (June 67). I Have never heard a good explanation of why they were not offered in the beggining of the 67 model year, but became available late in the model year. Supposedly only 6 or 7 were built.
Hope this helps.
Dave