Highest flowing sbm heads?

LOL! I see it as a small block. The fact that it shares nothing or next to nothing with the LA & A engines means nothing. The physical size of the block as I have seen them sitting next to each other in my buddies garage showed me there almost the same size. The pented are up from withstanding, milled off, the blocks are super close to the naked eye standing over them in there physical size.

You kind of have to NOT be looking to miss a big block sitting next to a small block and not notice the size difference.

It’s a G3 to me as well. The G3’s size says small block.
Put it next to a G2 426 block and the size is obvious.
One could say, “The small block G3 HEMI……”