Both engines have the same injectors and dual fuel pumps. However, they max out around 65 psi. The fuel pumps are controlled by a module that increases fuel pressure in relation to boost. There are aftermarket pumps and voltage controllers that will work with the factory ECM to increase capacity.
The cooler the fuel rails are, the cooler the fuel inside them will stay, which helps to improve injector performance and prevent power loss. With the AutoRama show rolling into Dallas, TX, auto photographers had their cameras ready and we were fortunate to get our hands on some of their work.
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The factory heads are based on the LS3 heads. However, they have a flow vane in the intake port. This helps emissions and idle stability, but reduces flow. CNC porting the heads is common. This removes the vane and improves airflow by about 70 cfm. Aftermarket cylinder heads are another option. These heads will flow even better than ported stock heads and have thicker deck surfaces to withstand more boost.
Like other LS engines, a cam swap is common. The LSA has a very small camshaft. Upgrading to a LS9 camshaft is worth about 30 hp, however, it won’t make more power until 4,800 rpm. It’s really only worth it if you plan on running at high rpm. Larger, aftermarket cams can add about 50 hp. Going as high as 0.630 in. of valve lift is also common. The table below gives some information on what to expect from different cams. (Note: We are assuming a standard blower, pulleys, and tune on pump gas.)
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