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M Part number is 57-1570
not grooved
880" in diameter
M Part number is 82-9602
Mushroom Head Tappet Adjusters - Choose Make / Model / Year Light M Part number is 57-1570Have you took apart your top end and noticed the ends of your valve tips have wear marks from the tappet adjusters? Although that is normal wear from usage the factory could have designed some better tappet adjusters. The problem The problem with the old style tappet adjusters is the design of the head. The head is flat and square. It does not contour the valve very well which "digs" into the valve stem and over time causing your valve stem to wear
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