GSC has two options for retainers you can either have Chro-Molly or Titanium do to the type of abuse a street cars valve train sees we suggest Chro-Molly and Ti for race car applications. The Chro-Molly will last just as long as the stock units that they will replace. Unlike Titanium these will not become brittle over time. They are only a few grams heavier than Titanium and will not affect performance. GSC Chro-Molly retainers are universal to use with either our single valve springs or our dual springs. The single valve springs do not require a new seat or different seals where as the duals will.

A set of valve springs can be changed in a matter of 2 hours with the correct tools, and is the best insurance a car with upgraded cams can have. The single springs have been tested higher but we suggest a max rev limit of 8500rpms. If higher revs or prolonged periods of revving i.e. road race applications, we suggest going to our dual springs which is more stable at higher rpms and can be revved to 10500rpms. The Single Spring kit includes: Single springs [email protected] with either Titanium or Chro-Molly Retainer.