Before you even think about buying a cam:
* What are your goals? More power? More torque at lower RPMs? A louder, more aggressive sound? A larger cam usually sacrifices low-end torque for higher-rpm power. If you mostly drive around town, a larger cam might make the car less drivable.
* What's your budget? Just the camshaft is only part of the cost. You'll likely need new lifters, pushrods (possibly), a valve spring upgrade (almost certainly), possibly rocker arms, and potentially a valve job. A professional mechanic will charge considerably more for labor.
* What's your mechanical skill level? This is a moderately involved job. If you're not comfortable working on engines, this is best left to a professional.
Choosing the Right Cam:
Selecting a camshaft requires understanding your engine and your goals. You'll need to consider these factors:
* Lobe Separation Angle (LSA): Affects the power band and overlap.
* Duration: The length of time a valve is open. More duration means more power at higher RPM, but less low-end torque. Duration is typically expressed at 0.050" valve lift.
* Lift: How far the valve opens. More lift generally means more power, but can also put stress on valve train components.
Instead of just "bigger," consider these points:
* Performance Cam Manufacturers: Companies like Comp Cams, Crane Cams, and Summit Racing offer a wide variety of cams specifically designed for small-block Chevrolet engines. Their websites have selection guides that can help you choose a cam based on your needs and engine specifications. *Use their guides, not just "bigger is better."*
* Talk to a professional: A performance shop specializing in older vehicles can advise you on the best cam for your specific application and goals. They can help you select the correct camshaft, and recommend the necessary accompanying parts.
In short: "Bigger cam" is too vague. You need to define your objectives and research specific camshafts appropriate for your 267 before even considering the purchase. A poorly chosen cam can make your El Camino a frustrating and underperforming vehicle.
