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Don't know about the trunk monkey camshaft on the 240 cam but the stamped code on the 240 engine was different than the 225 engine.
Through at least 1970, partial engines (short blocks) came with a camshaft installed in the block. At some point after that, the camshaft was deleted from the assembly in one or more blocks. I'm thinking service short blocks didn't have an assembly stamp code. Could be wrong. Getting old and memory is fading.
I had several buds who had the 240 HP engines in new 56 full size cars. the GM specs rate the engine at 245 HP
Last edited by PAmotorman; Oct 27, 2017 at 10:44 PM.