[blykins]

My guess is that an aluminum body is exactly like an original.

"I" would drop a cast iron block into a CSX or Kirkham, because I like repop stuff.....not resto-mod stuff.

Let me ask you, Rod......why do you think all the engine builders want a cast iron block?

Undy,

Aluminum blocks expand. They squirm. They distort. You lose ring seal. Remember, you GAIN .014-.015" of valve lash (or lose that much preload on a hydraulic cam) on an all-aluminum engine between cold and hot. Think about how much things are moving around.

I think all that's worth saying has already been said and this isn't going to turn into a small block/big block thread on my account. So, I'll see you all on the other side.