Looking to confirm casting number's on a GM57LG SGI.

[oldschoolnewstyle]

Casting numbers read, 10125327.

Any help or spec's would be appreciated.

[WallaceChevy]

It's a second-generation LT-4 engine that was available in the Camero, Corvette, and Firebird in 1996-97. 350 cu in with either 2 or 4 cap bolts, reverse flow cooling.

[ChevyHiPro]

Here's the short story on your engine from the casting number, 10125327;
"10125327 - 1993-up 350 Camaro/firebird 2 & 4-bolt LT-1 Reverse cooling Roller cam"

And, it's got a roller cam!
Sweet!

One can build a lot of horse power and torque with these engines!

Check out the heads you have on it, by their casting numbers.
With the right set of heads and the right cam, this one will put out some serious grunt for you!

Good luck with your project!