Been suitable for 1200-1600ccm type 1 engine starting from August 1960… These strengthened rocker arm shafts should be used with sport engines with sport cam shafts or harder valve springs…. By the higher load when using series, the original waves spring clips can break…. From there our strengthened Rocker shaft are equipped with rounded off and boltable ends…. in addition setting shims providedly around exact adjusting of the rocker arms and a better valve gear to ensure…. Quotation per pair with assembly accessories