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Lq4 prc2.5 heads flycut pistons how to#
Lq4 prc2.5 heads flycut pistons install#
Lq4 prc2.5 heads flycut pistons free#

A plate system has better distribution than the original intake, but an eight-nozzle fogger system is even better. If you’re wanting to get serious, a single plane intake is less prone to break from a nitrous backfire. Keep in mind the tight piston ring-gap is the limiting factor beyond that.

A nitrous oxide kit (at low settings) is great for street driving with stock internals.

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.

Lq4 prc2.5 heads flycut pistons install#

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. The bigger the engine, the smoother it will idle for any given cam, which is why you’ll see the 6.0L LQ4 and LQ9 engines getting slightly bigger cams than the 5.3L engines.Ĭonverter recommended. To maximize torque in the mid-range, manufactures close the intake valve at about 40 degrees in.) after bottom dead center and alter the intake valve opening to set the idle quality. What you need is a cam that delivers a gut-punch right where the converter hits. Regardless of whether you add a power-adder, the original camshaft is small and should be jettisoned immediately.Īn LS3 or LS9 cam makes good power, but not where you want it. 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.

Lq4 prc2.5 heads flycut pistons free#

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.

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.

GM made a bazillion of them which helps keep prices down.

With iron block strength, they are the first choice for boost or nitrous applications.These engines are some of the most popular GM LS engines for several reasons: Because of their strength, these engines are likely to see a power-adder sooner than later. These engines start life in trucks, but there’s just as much of a chance that you’ll spot them under the hood of a turbocharged drag car.

Lq4 prc2.5 heads flycut pistons how to#

… How to Get More Power From Your LQ4 or LQ9 LQ9 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More.LQ4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More.To chart the changes in the LQ4 or LQ9 over the years, check out these articles: It cranked out 345 horsepower, had 10.1:1 compression, and had other nice features like full-floating pistons. The LQ9 was introduced in 2002 for the Cadillac Escalade and was found in top-of-the-line trucks until 2007. That changed in 2001 when GM threw in the bigger cam and aluminum heads designed for the LQ9. Iron heads, small cam and the old SBC crank rear flange thickness.

It started off life like any normal truck engine. The LQ4 served in anything from bread-vans and boats to SUV’s between 1999 and ’07.