Heavy-duty cylinder studs are necessary to prevent head gasket leakage in high compression and turbocharged engines. Stock studs are made from poor material that will stretch and allow gasket leakage. APE studs are made from heat treated chrome moly and have rolled threads for maximum strength. APE originated heavy-duty studs for per­for­mance motorcycles and today is rec­og­nized as the industry’s lead­ing manufacturer. No matter whose parts you have in your engine, join the top names in racing and insist on APE studs to hold it all together. Sold in sets.