I've seen that thread over there on CP before,don't really agree with it entirely,and would'nt bet much on it being the final word on this either.
As I remember they said they cut a 400 block,then based their assumptions on the fact that the spacing between the cylinders in the water jacket were the same between the 400 and 350,therefore the castings were all the same.
And like I said before,I would'nt bet the farm on it,thats all.
But I
could be wrong.
Like I said before as well,wish someone would prove this one way or the other,we need a pontiac "mythbuster" on this one!
And IMO it'll take more than cutting any
one single block to prove otherwise,more like a couple of blocks from various years of each casting #.
Too many chances for variations to be 100% sure as a "fact" that they all would be able to go that big.
Sonic testing is the only real way to know for sure before any machining is done.
Me myself,I dont like to run "minimum wall thickness" just to run a 400,if I want a 400,I'll use a 400 to begin with.
If I want more cubes from my 350,I'll use the 4" stroke crank!
The rest of ya'll can do as you see fit,good luck to all.
