Making sure your valves open and close at the right time, for the right amount of time is essential for your 1978 GMC G15. A performance camshaft will make sure this happens, and also let you get the most out of your engine modifications. Performance camshafts will have longer duration in which the valves are open which will increase your higher RPM power. Not only will they help your higher RPM power, but will help produce less vacuum at low RPM by having increased overlap. There are many specs to keep in mind when looking into camshafts. Depending on your vehicle and what your using your vehicle for, the type of cam needed can vary. The type of power and ride your looking for will also be a factor to have in mind. We have something for the daily that’s looking for a little more fun, the track cars, and for those who heavy duty tow. Sport Compact Warehouse is your premier source for performance camshafts so you will find a large selection in our catalog. Reach out to one of our experienced representatives today if you have any questions and we will help you make a more informative decision.