Which LS engine is best for turbo/boost?
Popular choices are the iron-block 6.0 truck engines (LQ4, LQ9, LY6, L96) and the 5.3s: plentiful, cheap and proven in boost builds. A proven 800 hp 6.0 single-turbo recipe keeps the stock bottom end but requires E85 at that level. The 600 hp 5.3 turbo recipe is mostly bolt-ons, and the 700 hp 5.3 adds a cam, head studs, LS7 lifters and a timing chain (no pistons or rods in the list).
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Past those levels Speedway's 1,000 hp 6.0 recipe adds forged pistons and H-beam rods. Budget the fuel system too: the stock filter/regulator tops out around 450 hp.