Add to Favorite Sellers. 71221011HKR Hooker BlackHeart LS Swap Engine Adapter Plates. Holley Factory Refurbished Items are warranted for a period of 90 days from date of sale for defects in material and workmanship. Any defective items will be repaired or replaced at Holley’s discretion. Customer Service & Feedback. So we have a chance to make it right – we want your repeat business! Check out the official Holley Performance. For more great deals!!