Specifically, the OE trunnions and trunnion bearings should be replaced with an aftermarket upgrade kit. However, in the process of building/modifying any performance LS engine, if you plan to use OE rocker arms (whether re-using originals or using new OE rockers), you should be aware of the critical need to perform an upgrade to the rocker arms.
Overall, the factory LS engines offer surprisingly decent durability. The performance aftermarket has a solid grip on the LS platform (and continues to develop go-fast components for the LS), making it easy to pump additional ponies and torque without gnashing your teeth or bruising your brain. It’s relatively easy to make these buggers scream, thanks in large part to the advanced cylinder head designs that were started by GM and further HP-injected via a wide selection of aftermarket heads. The oiling and sealing systems represent drastic improvements over the early smallblock design, and they make great platforms for additional aftermarket power enhancements. Even straight out of the factory, the LS (in all of its variants) produces decent power. Highly regarded as “today’s” hot smallblock Chevy, GM’s family of LS engines represents a real milestone in performance V8 engine design.
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