Quote Originally Posted by txarkitekt View Post
An L33 is a Gen III motor. No Gen IV L33 motors were made. The LH6 is the Gen IV aluminum 5.3L motor...and the LC9 is the FF aluminum 5.3L Gen Iv motor.

But like I said--he needs to go look at the motor and check for casting numbers.
I know the L33 is a gen III engine. But some early Gen IV 5.3's had 799 heads. So it could be a Gen IV engine.