| This is a complete set of high performance valve springs. It includes 12 chrome silicon dual valve springs which is enough to do one 6 cylinder L series engine. It does not include retainers, those must be purchased separately, see listing. These springs should be used with high performance cams only. These springs increase seat pressure to 110 lbs. to help eliminate valve flotation at higher revs. The stock valve springs are only good to about 6700 rpm. While we usually carry these units in stock, If we happen to be out of stock on these springs please allow an extra week for delivery. Last update 12/11 | 
