![]() ![]() ![]() Swapping a set of heads onto your motor isn't the most straight forward job but it will make a world of difference. Vacuum is often a good way to measure a camshaft's efficiency with higher numbers being better. The stock cam provided 20-inches of vacuum while the GM Hot Cam produced 16-inches. To complement the cam we are running a stock diameter TPIS valve spring with dampers with titanium retainers and Manly pushrods that are good up to a. Since the GM LT4 Hot Cam was designed to be used with a 1.6 rocker, we were interested to see what would happen if we left the 1.5 rocker in as we know some of you might not necessarily follow the instructions to the letter. 500 duration with a 5.25 lift on the intake and exhaust with a lobe separation of 112. ![]() This cams specs at 218-inake, 228-exhaust at. That height and length of time can be changed with various cam options. Essentially, think of the camshaft as the device that holds the valve open for a certain period of time and at a certain height. That's exactly what the camshaft does, it correctly times and accurately measures the amount of air that gets into the combustion chamber through manipulation of the valve duration and lift. The amount of air that gets into the motor is completely worthless unless it's carefully controlled. ![]()
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