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FAQ:
Q: What kind of engine is a LQ4?
A: Meet the weapon of choice for big boost. The LQ4 and LQ9 are Gen. III, 6.0L, iron block, truck engines. The LQ4 served in anything from bread-vans and boats to SUV’s between 1999 and ’07. It started off life like any normal truck engine. Iron heads, small cam and the old SBC crank rear flange thickness.
Q: What year did the LQ9 engine come out?
A: That changed in 2001 when GM threw in the bigger cam and aluminum heads designed for the LQ9. The LQ9 was introduced in 2002 for the Cadillac Escalade and was found in top-of-the-line trucks until 2007. It cranked out 345 horsepower, had 10.1:1 compression, and had other nice features like full-floating pistons.
Q: How much HP can you add to a LQ4 fuel system?
A: Upgrading the LQ4/LQ9 Fuel System and Tuning The factory injectors are only rated at 25 lbs. and won’t support much more than 380 hp. Plan on upgrading to larger fuel injectors to meet the fuel demands of increased power. Custom tuning will be required to properly adjust the fuel and ignition timing.
Q: What parts are needed for a lq4/lq9 cam swap?
A: There are a few other parts needed for a LQ4/LQ9 cam swap such as an LS2 timing chain, LS7 spec lifters, LS2 timing chain damper and adapter, and .080 in. wall pushrods.