This is a brand new set of Patriot double valve springs, part #4570, complete with retainers, keepers and new valve seals, good for up to .550 lift, 130 lbs seat pressure, 335 lbs open. I bought them in 2010, for my small block Chev, but never used them. Will fit other engines. Were $175.00 CAD in 2010. Asking $125.00 or best offer Just reduced to $99.00. Make me an offer.