Anyone used single valve springs with success from one of the above?
Looking to safely run up to 18 or 19psi through a gt25 on my 2.0L

Kents are £180ish and don't need different retainers, Piper are £205 with caps, or Devil Developments with caps at £250.
Trying to save a few bucks!

http://www.pumaspeed.co.uk/product-P...-Kit_15954.jsp

http://www.larkspeed.com/index.pl?p=42VS60&a=i

http://www.catcams.com/products/valvesprings.aspx