SMF - Just Installed!
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Faron , Hastings make a "groove lock spacer" that is .030 thick. This is commonly used along with a 1.2mm ring in a "normal" 5/64ths groove. The trouble is in finding a 1.2 MM top ring in 4.090
Ross , The second uses the same spacer with a 1/16th ring. At that point it's better to buy a new set of pistons with the correct smaller grooves. Spacers are subject to inertia and that presents other issues. Randy