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Ford Mustang Comp Cams - Three-Valve Thump - Tech



Three Valve Comp Cams Bolt
The cam caps are bolted down to 89 in-lb.		 Three Valve Comp Cams Bolt Sprocket
Once the cam is in place, bolt on the cam sprocket and attach the chain.		 Three Valve Comp Cams Camshaft Phaser
A new camshaft phaser bolt from Ford is required, as they are torque-to-yield-style bolts. Once they are used and removed, they are useless. Do not reuse your old cam phaser bolt. You will need two bolts, which are available from your Ford dealer (PN 3L3Z-6279-DA).
Three Valve Comp Cams Phaser Bolt
The camshaft phaser bolt is torqued into place to 30 ft-lb. The torque wrench is then turned 90 degrees, thus "stretching" the bolt, rendering it useless when removed.		 Three Valve Comp Cams Jpc
This is a tool that JPC made for these applications. One end has the tip of a spark plug, the centersection is a tube, and the top is an air-hose attachment. It has been welded together to prevent leaks.		 Three Valve Comp Cams Air Compressor
The JPC tool is screwed into the No. 1 cylinder, and the air compressor is attached to it. The air pressurizes the cylinder to hold the valves closed. This is important, as the compressed air allows the valvesprings to be removed without dropping the valves into the cylinder. This process will be duplicated for each cylinder.
Three Valve Comp Cams Valvesprings
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.		 Three Valve Comp Cams Retainers
A change in valvesprings requires new retainers. The left retainer is Comp's titanium-style retainer, designed to work with the Beehive valvesprings. On the right is a stock retainer.		 Three Valve Comp Cams Compress
We used the Ford tool to compress the valvespring so we could remove the locks (arrow) using a magnet. The locks are basically two half circles that clamp around the valve stem grooves and lock the retainer in place. This way, the valve, retainer, and spring move as one unit as the cam follower opens and closes the valve, as dictated by the camshaft lobe.
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