This is partially due to a larger intercooler mounted in front of the radiator. A centrifugal-style supercharger is lightweight and makes more power at high rpm.A roots-style supercharger is dependable and makes great torque in the low- and mid-rpm range.Okay, with that out of the way, let’s get to the fun stuff. Any power will put you well past the limitations of the stock injectors and pump.A 4-corner steam kit reduces hot spots that cause the rings to butt and snap the piston’s ring lands.Before we get into the power adders…there’s a couple things to address: In general, the LQ4 and LQ9 will see boost or nitrous before serious head work. 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. You will want to install a trunnion kit for added reliability. Spring life isn’t a problem because trucks generally don’t spend a lot of time at high rpm. lift cams are popular, but LS6 springs allow you to run. Heads and intake good for another 50+ hp.ĭrop-in. Still can drive daily.įly-cutting the pistons may be required. Regardless of whether you add a power-adder, the original camshaft is small and should be jettisoned immediately.Ĭonverter recommended. Upgrading the LQ4/LQ9 Camshaft and Valvetrain Before you go, make sure to install a colder thermostat to open up the tuning window.īelow are more upgrades that will improve the performance of the LQ4 and LQ9 engines. It also makes it easier tune for a bigger cam and injectors later on. Whether you’re towing on low-octane or springing for good fuel, a tuner can dial the ECM and take it to the next level. All these can be done in the garage, but the tune won’t be optimized.Īt this point, we recommend you talk to your chassis dyno tuner and decide on a computer programmer. An electric fan kit will free up the power. Trucks often come with mechanical fans that sap horsepower. The problem is that the engine starts to sound REALLY good and owners find themselves wanting to go faster. Trucks are the everyday hotrods of the 21 st century.įor a lot of people, it starts off with a cold air intake and aftermarket exhaust. (Image/Summit Racing) Basic Bolt-On Upgrades for LQ4 and LQ9 Displacement-364 cubic inches to be exact.ĭo they have a downside? Just one.The heads flow similarly to LS6 heads, but have bigger chambers making them boost friendly.3 engines didn’t have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you don’t have the expense of an AFM or VVT delete kit.
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