Has anyone heard why these engines are not available yet?

Hmmm,, its in the catalog,,,, where did you here it wasnt?

I made a few inquires on this motor a short time ago. I was told that it would not be available until around October.

GM is doing there final durability testing right now. From what I've heard they should be available within the next two to three months.

What are the specs on the engine?

According to Scoggin-Dickey Parts Center, they are "soon to be released" and "call for part number and price". They do list the specs though. There are 2 versions;

ZZ572/620
Tall Deck Sportsman Bow-Tie Gen VI Block
9.5:1
GM forged 4340 4.375" crank
Aluminum Rectangle 118cc heads 2.25/1.88
Camshaft: 254/264 @ .050" .632" lift
Single plane high rise intake (doesn't give brand but looks like a victor)
Holley 4150 850cfm
650 ft/lbs @ 4500
620 Hp @ 5500

ZZ572/720R (R being for Race)
Same block, crank, heads and intake
12:1 Compression
Camshaft: 266/274 @ .050" .714" lift
Holley 4500 1095cfm Dominator
685 ft/lbs @ 4500
720 hp @ 6250

The 620 horsepower short block looks like it might work just fine in marine application. A 572 with 9.5 to 1 compression, brand new and all assembled. I will just have to wait and see what the price is.

Good information here..

http://www.sallee-chevrolet.com/Sneak/Previews.html