IPD was the first to market DD15 and now IPD is the first to offer an engine kit with cryo-treated head bolts! IPD has upgraded our DD15’s in-frame kit’s coverage and it now includes all the head bolts, gaskets and fasteners needed for a full engine rebuild. These kits use brand new, quality IPD parts and they are in stock and ready to ship! Upgrade your kit by purchasing the optional cryo-treated head bolts to extend the life of your head bolts with less internal stress and optimized tensile strength. Cryo-treating also ensures proper and even clamping forces across your cylinder head. Click here to download the updated brochure for the DD15 parts catalog. This includes a breakdown of all the part numbers in each kit so that you know exactly which part you need for your specific engine type.