If you want to use a Fluid dampner why not call the people who manufacture the dampner you want to use and see if they will help.I always have my Cranksafts balanced with the dampner I plan on using.I use fliud dampners on all my racemotors but not on street motors and perfer the use of SFI approved balancers when possible.I have been machining 292 balancers to fit 235-261 motors for years with no problems to date. Just a thought--Paul
