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LS engine cam swaps are popular upgrades for improving the performance of OBS (Old Body Style) trucks, especially in the context of Skywalker Performance tuning. When performing a cam swap, understanding the cam timing events such as Top Dead Center (TDC) and cam duration is essential to maximize engine output and efficiency. Camshaft specifications like intake and exhaust timing (e.g., TDC ANST, TDC OR) and cam flow data (noted as TrickoLow, TrickoTowr in OCR data) provide valuable insights into how intake and exhaust valves open and close relative to the piston position. These parameters influence torque, horsepower, and throttle response. Accurate measurement tools, including dial indicators and degree wheels, help verify camshaft specifications such as timing at TDC and cam lift at specific crank angles (e.g., 30°, 40°, 50°). Ensuring proper cam phase alignment and overlap can improve combustion efficiency and engine breathing. In performance LS builds for OBS trucks, selecting the right cam profile balances daily drivability with desired power gains. Considerations include the cam's advertised duration, lift, and lobe separation angle, which affect idle quality and mid-range torque. Incorporating cam swap data from reliable performance shops like Skywalker Performance and referencing flow bench results ensures that modifications yield predictable outcomes. This approach aids enthusiasts and mechanics aiming to optimize their LS-powered OBS trucks for both street and light competition use.