GCRE will not supply pistons for these models unless fully floating wrist pins are used, which means some models of connecting rods with fully floating pin pins will be required.

If custom valve relief machining is required, the owner must mark all valves by dry construction before building the cylinder head and specify the valve diameter and valve relief depth if returned to GCRE so that the machining is correct. Valve lift must be set at TDC on the overlap. The cost is: (per 4-piston set) 2 reliefs per piston €130, 4 reliefs per piston €260.