The cylinders were cast joined to each other all the way down so it could be
bored bigger. That reduced the cooling flow around the cylinders.

"Tim" wrote in message
ups.com...

Calif Bill wrote:
I said mine was the MPI. The link is to a 315 hp carbed motor. And the
400's sucked in cars also, the cooling left a lot to be desired.

a person could probably use a 400 on a fresh water system with no much
problem with cooling, but the blocks are thin, like it was factory
bored about as far as one would want to take it.

I never was impressed with the 400 Chevy.