Editing Adjusting solid lifters (section)
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===Using Valve Lash to Help Tune the Engine (aka "lash loop")=== Ideally, the cam- if selected carefully- should be right when using the manufacturer's recommendations for lash and phasing (advance/retard vs. the crankshaft). But if there have been changes made to the engine or the cam isn't ideal, using a "Lash Loop" will point you in the direction the engine needs when replacing the cam. The engine only responds to the actual movement of the valves. Since the valve cannot move until all the running clearance (valve lash) has been taken up, the amount of valve lash you use affects the engine's performance. For example, if you decrease the amount of (hot) valve lash, the valve will open slightly sooner, lift higher, and close later. This makes the camshaft look bigger to the engine, because of a slight increase of actual running duration and lift. If you increase the amount of (hot) lash the opposite occurs. The valve will open later, lift less, and close sooner. This shows the engine a smaller cam with slightly less actual running duration and lift. You can use this method on a trial basis to see what the engine responds to and keep the setting that works the best. Just remember, the more lash you run, the noisier the valve train will be. If the clearance is excessive it can be harsh on the other valve train components. Therefore, for prolonged running of the engine we do not recommend increasing the amount of hot lash by more than +0.004" from the recommended setting. Nor do we recommend decreasing the hot lash by more than -0.008".
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