69 L72 CAM

[LS6 RAT]

Keith,

Very interesting point. A good example would be the L78 of 1965 and the L72 of 1966 for Corvette. Here we have a 396/425hp and a 427/425hp both rated the same, however the 1966 engine has a 31 cubic inch advantage, with both engines having all other factors the same. So either the 396 is over rated or the 427 is under rated.

To further confuse things, both engines are purported to use camshaft 3863143, however the specifications in Colvins book show differences in these cams for these two years. I don't know if his information is incorrect, or that GM would actually use the same part number for two different specifications? And again this same camshaft 3863143 uses different specs in later applications. Although camshaft 3904362 is called for use, in these same later applications.