L-78 engine Birth date

[nuch_ss396]

This brings up a good point.

How did the '65 396 go from 375hp to 425hp ( Vette only )?
It could not have been just the Vette header-like exhaust
manifolds. Was it a combo of exhaust & ignition? I'm
positive the '65 396-425hp & the '66 396-375hp as well as
the '66 427-425hp all used the 3863143 camshaft.

So, where did those extra 50 hp come from

I remember a Vette owner telling me that some of the SHP
full sized cars came with Corvette exhaust manifolds on
them. Funny, I can't ever recall seeing one of them like
that back in the day.

With GM's interest in making the Camaro the "brute of the
street", you'd think they would have come up with a better
exhaust manifold setup for the F-bodies.

Anyone got any ideas?

Steve