* Valve Springs: A larger camshaft requires stronger valve springs to keep the valves from floating (not closing properly at high RPM). Weak springs will lead to engine damage.
* Pushrods: Length and strength of pushrods must match the cam's lift and the rocker arm geometry.
* Rocker Arms: Ratio and design of rocker arms need to be compatible with the cam and valve train components.
* Cylinder Heads: The port design and flow characteristics of the cylinder heads significantly impact the cam's effectiveness. A cam designed for high-flow heads will be less effective in low-flow heads.
* Intended Use: A cam optimized for a drag race car will be completely unsuitable for a street-driven vehicle.
* Clearances: The camshaft needs sufficient clearance within the engine block. Some aftermarket cams might require machining to ensure proper fit.
Instead of focusing on the "biggest," consider the intended use of your engine. A camshaft should be selected based on your needs:
* Street car: A milder cam will provide a good balance of power and drivability.
* Muscle car/Street Performance: A moderate cam will offer improved performance without sacrificing too much street manners.
* Race car: Larger cams are acceptable, often requiring significant modifications to the engine.
In short, there's no "biggest" cam, only a cam that's appropriately sized and matched to the rest of your engine's components and intended purpose. Consulting with a reputable engine builder is crucial for selecting the proper camshaft for your specific application.
