The last step in the assembly...
The last step in the assembly is weighing the engine. Because the LS9 doesn't have a dipstick, the oil is later added by weight, making it important to know what the engine weighs dry-529.8 pounds in this case.
Each assembled engine is first...
Each assembled engine is first run on natural gas so it can be externally balanced. After that it's put though a 45-minute cold test run by a DC motor. When the engines are complete, they are double checked and sent offsite for a 20-minute hot test and dyno validation. It takes from 4.5 to 5 hours to build an LS9 at Wixom, which means it can churn out around 45 units a week. We'd all like to see LS9s available as crate engines, but for now, every one is bound for a ZR1-and there's no shortage of willing buyers.
|LS9 SPECS |
|Displacement ||376 ci |
|Bore and stroke ||4.06 x 3.62 inches |
|Block material ||Cast aluminum |
|Head material ||A356-T6 rotacast aluminum |
|Valvetrain ||Overhead valve, 2.16-inch titanium intake, and 1.59 inch hollow-stem, sodium-filled exhaust |
|Fuel delivery ||SFI (sequential fuel injection) |
|Compression ratio ||9.1:1 |
|Horsepower ||638 @ 6,500 rpm |
|Torque ||604 lb-ft @ 3,800 rpm |
|Fuel ||Premium required |
|Exhaust manifolds ||Stainless steel |
|Crankshaft ||Forged steel |
|Type ||Hydraulic roller |
|Lift ||0.562/0.558-inch intake/exhaust |
|Duration at 0.050 ||211/230 degrees intake/exhaust |
|Supercharger ||Eaton R2300 four-lobe Roots-style displacing 2.3 liters |
|Boost ||10.5 psi maximum |