In high-speed engines, in combination with a high-lift camshaft and reinforced valve springs, standard aluminum pushrods cannot withstand and bend spontaneously. Even if only double valve springs are used, there is a risk of bending.
Avoid this problem and replace your original aluminum pushrods with these high quality, heat treated steel rods.
They are intended for standard length, if you are working with a long stroke engine or other modifications that make the standard length inadequate, get chrome-moly models that should be made to the desired length. You can find them, among others, in the "Alternatives" tab.
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