LS3 Crate Engine - Race Engine | Chevrolet Performance As the standard engine in the fifth-generation Camaro SS and C6 Corvette, the high-revving, deep-breathing LS3 6 is poised to go down in history as one of Chevrolet’s best and most versatile engines. LS3 Coolant flow diagram? - Don Terrill’s Speed-Talk LS3 Coolant flow diagram? Post by racer189 » Wed Jun 24, 2009 12:47 am Coolant is also pumped through the water pump outlet and into the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat. LS Series 19171935 - Chevrolet PDF fileLS2/LS3/LS376s or 50 gph for LSX454 & LS7s. Vehicle performance/ driveability and engine durability may be affected if the correct pressure or flow are not maintained. IMPORTANT: Read the “System DOs and DON’Ts” section below before attempting to install the engine and then review again before attempting start the vehicle.