Swapping anLS engineinto your Chevelle?Time to change out the choakingfactory exhaust manifolds to a set of Doug Thorley headersjust a little shorter than true long tube headers. We designed these to give you the maximum in performance while keeping them short enough so they dont smack the ground like long tube headers are known for. Shorter design makes for an easierinstallation than long tubes so you definitely don’t need to be lowered to run these. Madeout of industry leading 14-gauge tubing with 3/8″ thick flanges and come beautifully ceramic coated to greatly reduce under-hood temperatures and protect them from the environment.All of this 100% American made, and backed by our lifetime warranty of course!