Ford Mustang Comp Cams - Three-Valve Thump - Tech
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The stock valvesprings (right) versus the Comp Beehive springs (left). The Comp springs are required when running the XE261H-15.5 camshafts on Three-Valve engines. The stock springs can be used with Comp's milder Three-Valve cams, but the smaller cams come with smaller power gains. It all depends on how much you want to spend and the power levels you are looking to attain with your S197 Mustang. View Related Article
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