When overhauling the engine, replacing as many of the wear items as possible will simplify the reassembly and subsequent adjustments required to set up the valve gear correctly. The most vital items include valve guides, valves and valve springs. This new VALVE
Rocker is also a 'must have' item and will improve the overall results.
Where possible always try and renew the complete valve train assembly. Try our pro-workshop gasket sealant, 08C70K0234M to complete the job like a professional!