Although these engines are definitely cleaner running, with sequential port fuel injection and precise engine management systems, to be CARB-approved, every single component of the donor chassis needs to be in place, from the smallest hose in the EVAP system to the manifolds and catalytic converters, which may or may not fit GMT400's frame. Things aren't any easier for folks looking to install a newer 4.8, 5.3, or any other LS1 variant. With today's aftermarket performance parts, it's entirely possible to build a cleaner running, more powerful, and more fuel-efficient small block Chevy to replace the outdated TBI system and its accompanying electronics. It's shortsighted for places like California to be so restrictive with what modifications are allowed.
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