Take a look at the latest E-Rod LS3 crate motor offerings from GM Performance Parts with the guys at Speed Wrench.
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The Lowdown on GM Performance Part’s E-ROD LS3 – Finding a Solution to SMOG Problems
For those of us that are looking to accomplish a complete motor swap in our trucks or a brand new build with the goal of more power and reliability, modern LS-based motors are currently the best ticket. They offer great control over power and reliability and are considered to be our generations SBC. The Small Block Chevrolet (SBC) engine has long been a staple of the customizing community. The engine has remained relatively unchanged for decades and thousands of parts are available for the SBC in case you want some added power. If you are looking to get past the 300 or 400 horsepower range however you would have to build up the engine greatly. This usually consists of a new performance parts including a hot camshaft, forged pistons, ported heads, etc.. The list goes on and the dent in the wallet deepens. But no matter how you cut it, once a emissions control referee pops the hood and sees a different motor that has been built up, red flags go off at the inspection and your truck will most likely only see the streets while sitting atop a trailer. A solution is needed that offers the best of both worlds, power and emissions compliance.