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FREE Pull Pack & Ship in less than 24hrs 5 days a week From Memphis TN USA RPQ BrownBoxCams Titanium Lite-Weight Performance Valve Spring Retainersfit: Shredder Head w/ 5.5mm valve stemsthese are intended for BIG Springs (check our other listings for smaller sizes)Outer spring 23mm O/D 18.15mm I/DInner spring 13.46mm I/DTotal height of retainer is 6.6mm Our exclusive RPQ design allows all our retainers to be used with 5 or 5.5mm valve stems when used with the appropriate matching split-locks Predator, Clone, Honda, Tillotson, BSP, NR, ARC 196cc 208cc 212cc 224cc 236cc 5.5mm Valve stem Split-locks are included with this set YOUR VALVES MUST BE THE SINGLE GROOVE TYPE THAT ACCEPTS SPLIT LOCKS!As used by many of the top engine builders!Kit Includes2ea Big 23mm outside diameter RPQ Titanium spring retainers & split locks Split locks for 2 valves (4ea in 5.5mm size) Retainers Allows the use of 37lb+ single valve springs or 60lb+ if used with dual springs installation requires mechanical ability and knowledge of how to build performance heads and all that entails.