This includes the heads, cam, valvetrain, intake, and throttle body. They will improve the performance and fuel economy of a stock engine.Ĭhanging the top end parts is the next level of upgrading the engine. These upgrades are relatively easy on your back and your wallet. The question is “How far do you want to go?” Bolt-on Upgrades However, they will also be more involved and require deeper pockets. Each level will provide more performance than the one before it. If you don’t do it right, you will get less power and performance. Often, when you change one part, you will need to change other parts at the same time. Upgrading the LS7 can be expensive and complicated. Changing one thing can affect the performance of the other parts. All the stock components are matched to each other. The chart below lists the specs for common bore and stroke combination.The LS7 is specially designed and built to make over 500 hp. stroke crankshaft will also increase displacement. This keeps the walls thick enough to support boost. Cylinder heads with 6 bolts per cylinder.A stronger, aftermarket engine block with 6 head bolts per cylinder.At that point, you will need to basically build a whole new engine. (The LS9 came with forged pistons from the factory.)ĭue to extremely high cylinder pressure, the heads can start to lift around 1,000 hp. This will destroy the cast pistons in the LSA. Bottom End Upgradesĭetonation can occur if inlet air temperatures get too high and/or low octane is used. Swapping in a set of Full Roller Rockers is another option. We strongly recommend a Trunnion Upgrade Kit. The trunnion bearings in the stock rocker arms are a known weak point. They will reduce the valve weight and prevent Valve Float. Upgrading the camshaft will require the matching Valve Springs. (We are assuming a standard blower, pulleys, and tune on pump gas.) The table below gives some information on what to expect from different cams. Larger, Aftermarket Cams can add about 50 hp. It's really only worth it if you plan on running at high rpm. However, it won’t make any more power until 4,800 rpm. Upgrading to a LS9 Camshaft is worth about 30 hp. Like other LS engines, a cam swap is common. These heads will flow even better than ported stock heads and have thicker deck surfaces to withstand more boost. This removes the vain and improves airflow by about 70 cfm.Īftermarket Cylinder Heads are another option. This helps emissions and idle stability, but reduces flow. However, they have a flow vain in the intake port. The factory heads are based on the LS3 heads. The stock dual fuel pumps are good to about 650 hp.The stock injectors are good to about 600 hp.There are aftermarket pumps and Voltage Controllers that will work with the factory ECM to increase capacity. The fuel pumps are controlled by a module that increases fuel pressure in relation to boost. Fuel Systemīoth engines have the same injectors and dual fuel pumps. They run cooler and still fit under short hood-lines. Many have larger plenums, more intercooling capacity and better flow paths. Install an aftermarket snout and a larger throttle body = about 30 hp.Īftermarket Blowers are also available.Other Upgrades to the 2.3L LS9 Supercharger ![]()
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