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Hi-Torq Aggressive Series Hydraulic Roller Cams
For the dedicated Pontiac enthusiast building a race-inspired street car or a weekend bracket machine, the search for the ultimate hydraulic roller camshaft ends with the Butler Performance Hi-Torq Aggressive Series. This lineup is designed to surpass the already stout 500–600 HP range of the Performance Series, pushing the envelope of what a streetable hydraulic roller setup can deliver in a big-cube Pontiac V8.
The Aggressive Series is characterized by its high lift, increased duration, and tighter lobe separation angles (LSAs), all engineered to maximize cylinder head flow and exploit the massive displacement capability of the Pontiac 455 and stroked 400 blocks (often reaching 461 to over 500 cubic inches).
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The Aggressive Series Philosophy
Butler Performance identifies the Hi-Torq Aggressive Series as the choice for builders seeking "serious street performance to all-out racing" who still want the low-maintenance benefits of a hydraulic roller system. These cams are custom-ground with aggressive lobe profiles that are exclusive to Butler Performance, ensuring maximum power while leveraging modern roller lifter technology.
A prime example of this extreme street-strip focus is one of the top grinds in this series, the BP805X, which is often found in Butler Performance's own massive 500+ cubic inch engine builds
Key Considerations for Aggressive Builds
Stepping up to the Aggressive Series requires matching the camshaft's extreme demands with appropriate supporting hardware. The resulting engine is a high-RPM, high-vacuum monster that produces peak power higher in the rev range.
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Cylinder Head Requirements: These cams absolutely require high-flowing cylinder heads, such as CNC-ported Edelbrock or aftermarket Ram Air IV/Super Duty (SD) style heads. Poorly ported or stock heads will limit the engine's potential and create a mismatched setup.
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Valve Train Durability: Due to the high spring pressures and rapid acceleration caused by the aggressive lobe profile, the valvetrain must be fully upgraded. Builders must use premium components like high-end hydraulic roller lifters (e.g., Johnson or Morel), strong pushrods, and high-rate dual valve springs to control the valvetrain at high RPMs.
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Idle Quality and Vacuum: The high duration and tight Lobe Separation Angle (LSA)—often or to maximize mid-range torque—will result in a rough, choppy idle and significantly lower manifold vacuum compared to street-friendly cams. This is a trade-off inherent in maximizing performance, but it gives the engine the unmistakable sound of a true racing machine.
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Engine Displacement: The Aggressive Series is best suited for big-cube combinations—typically 461ci and larger—where the greater displacement can better absorb the high duration specs and maintain usable low-end torque.
In short, the Butler Performance Hi-Torq Aggressive Series Hydraulic Roller Cams are for the builder who prioritizes maximum naturally aspirated power from their Pontiac V8, using the reliability of a hydraulic roller setup right up to the very edge of racing performance.