The adjustment is important as well. The feel of a feeler gauge is critical. The tension on the feeler as it is pulled out from between the tip of the valve, and the rocker arm has two components, the first is the flatness of the gauge between the surfaces. such that the blade is ferr to find the least thickness, pinched gently, not at some non flat angle. The second is the tension as it is pushed and pulled through the gap. If you pinched a 1 foot steel shop ruler between your fingers hard enough to pick it up and have it dangle from one end, that tension is the same as the push pull feel on the blade. The tip of the rocker arm is often cup shaped and worn from pushing and sliding on the valve. If it is cup shaped and the gauge blade cannot be flat across the surface, the rocker tips will need to be arced on a valve machining tool. Usually they are OK, but I have seen tips with .008 wear that prevents clean adjustment. Jim
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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