Overview

Summit Racing™ Pro BBC Big Nasty LS Firing Order Hydraulic Retro-Fit Roller Cams

Summit Racing™ Pro BBC Big Nasty LS Firing Order hydraulic retro-fit roller cams are high performance aftermarket camshafts for big block Chevy engines. They use the modern LS-style firing order (1-8-7-2-6-5-4-3) to improve harmonic stability and reduce bearing load, while using a hydraulic roller design for modern street/strip power and reliability. Order the model with specs preferred for your application.

Key features and specs:

* Firing Order: Uses the LS firing order (1-8-7-2-6-5-4-3), which requires swapping spark plug wires. This design improves, and in some cases, "4-7" or "4/7-2/3" swaps, improving combustion chamber cooling and reducing vibration
* "Big Nasty" Profile: Represents a specific, aggressive grind designed for high performance
* Retro-Fit: Designed to fit older BBC engines that did not originally come with roller cams
* Construction: Precision-ground in the USA on premium billet-steel cores
* Valvetrain Compatibility: Designed for modern beehive or lightweight dual valve springs
* Requirements: A cam button, a melonized or composite distributor gear, and a billet-compatible fuel pump pushrod are required
* Performance Profile (Example: SUM-1257-H-O):
-- Lift: Often around the 0.550–0.625 in. range, compatible with modified factory or aftermarket heads
-- "Big Nasty" Specifics: Known for producing high torque in the mid-range while providing a solid, aggressive street idle
-- RPM Range: Designed for strong mid-range to high-RPM power, typically suitable for street/strip applications
* These cams allow traditional big block Chevy engines to utilize modern valve technology and firing order to achieve better performance and engine durability

Applications

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