We will replace or refund our merchandise if defective and returned to us within 180 days, in the same condition as purchased. We are not responsible for any shipping charges on return freight items. Our warranty is voided if parts are altered, disassembled, or overheated. Deposits void and cores not accepted after 30 days. We are not responsible for damages or any loss caused from installation, removal, or use of this merchandise. Our warranty does not cover labor charges. We highly recommend the professional installation or mechanical parts as our warranty is voided when damage to any part is due to improper installation. We reserve the right to withhold any refund or replacement until a certified mechanic of our choice can verify that damage is not due to improper installation. Proper installation includes, but is not limited to: the use and replacement of necessary fluids and gaskets, the proper flushing of any existing fluids, and the replacement of any necessary belts, filters, sensors, or gaskets. Engine warranties specifically only cover the block & head (heads) and internal parts. Accessories/manifolds/gaskets/sensors are not warrantied.