also in my "16v propper clearance" thread theres a pic from a 16v lifter i tore up. it has a check valve that allows fluid to enter, but not go. this way at low rpm, the valves are quiet. once pumped up, they have to be pulled out and drained, or hope they slowly leak. you will not increase clearance any other way.
if the lifters spin (as listed before) with the cam on the base circle on a cyl, you have clearance.
also, gauvin can order shims from germany at the dealer if needed.
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