Why Must I Install New Lifters With My New Flat Tappet Camshaft? - Engine Builder Magazine
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Why Must I Install New Lifters With My New Flat Tappet Camshaft?

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The following illustration demonstrates
why you must install new lifters:

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• A new lifter has a slight "crown." A new cam has a slightly tapered face that causes the lifter to rotate. Note the smooth, wide contact patern in Figure 1

• Installing a new cam with used lifters creates a concentrated contact pattern on the edge of the cam lobe (Figure 2).

• Eventually, the contact wears out the edge of the lobe and lifter. Soon, the cam lobe wears down and the lifter stops rotating (Figure 3).

– Tech Tip courtesy of Lunati figure 1figure 2Figure 3

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