Though the heads and cam took top billing, the kit also featured 1.7:1-ratio aluminum roller rockers, new hydraulic roller lifters, and a fresh set of MLS head gaskets. They weren't even breathing hard on our mild, carbureted 5.3L. Each 58cc chamber housed a 2.000/1.575-inch valve package that helped the GenX 205 heads flow enough to support over 550 hp on the right combination.
The GenX 205 heads featured full CNC porting on the intake, exhaust, and combustion chambers. The cam was combined with a set of TFS GenX 205 heads designed specifically for the small-bore size used by GM on the 4.8/5.3L engines. The heavy hitters in the kit were obviously the TFS Stage 1 cam, which offered 0.560-inch lift, a 216/220-degree duration split, and a 114-degree LSA. Designed by TFS to supply as much as 455 hp and 425 lb-ft of torque (on an injected 5.3L), the kit had everything we needed, including heads, cam, lifters, gaskets, and even new pushrods designed to work with the impressive GenX 205 cylinder heads.
HP Rewards qualifying and eligible products/purchases are defined as those from the following categories: Printers, Business PCs (Elite, Pro and Workstation brands), select Business Accessories and select Ink, Toner & Paper.After the baseline, we tore into the 5.3L and replaced the factory 862 heads and stock cam with the TFS top-end components supplied by Summit Racing (PN TFS-K305-455-425). ISP fees may apply and additional requirements may apply over time for updates.
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