MACE PERFORMANCE VALVE SPRING KIT TO SUIT HOLDEN STATESMAN WL WM ALLOYTEC SIDI LY7 LLT 3.6L V6This heavy duty performance valve spring kit is compatible with all Alloytec and SIDI V6 engines. Suited for high revving applications (ideally fitted with our own Mace camshafts) or boosted builds, these springs are a drop in replacement that require no modification to the cylinder heads. Ovate wire, Gas Nitride treated Beehive spring Ti Retainer Kit: SPG611 This kit includes an ovate wire, gas nitride treated beehive spring with light weight