This is for the LS conversion boys lookin for a killer set of heads. These are new never run All Pro 15* heads. This is for a 4" bore min. 2.125 Delwest Titanium intakes 1.610 Ferrera severe duty exhaust with matching titanium retainers and keepers for both int. and exh. Will sell bare or with valves. Currently do not have springs but were set up for a PSI spring. These are .800 lift capable heads. $1475 bare or depending on how you want them.