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Big-Block 540 ci 1. SRP inverted dome forged pistons. 2. The 8-inch TCI harmonic balancers are SFI approved to 12,000 rpm. They include a superstrong billet steel inertia ring for longer life, and a high-quality bonded runner eliminates outer ring movement. 3. Proform-fabricated (black) valve covers offer welded billet mounting rails for leak resistance and are 45 percent lighter than comparable stamped-steel die-cast covers. 4. The Weiand Stealth (rectangular port) dual-plane intake manifold offers good bottom-end torque with a special runner design and larger plenum for extra flow. 5. Fel-Pro 1075 MLS gaskets feature a solid-steel core to minimize gasket blowout. For extra sealing force, a preflattened steel-wire ring combustion seat with stainless steel “armor” is added around the combustion chambers.