GDO 5.4L Timing Chain Kit with Cam Phaser, Guide Rail, Gears & Gasket Set - Replacement for 5L3Z-6268-A, 3R2Z-6A257-DA, XL3Z-6306-AA, F85Z-6K25-AA - Compatible with 2004-2009 Ford F150 & 2005-2010 Lincoln Navigator 5.4L Triton 3V Engines - Perfect for Engine Repair & Maintenance

Bought this set for my 2010 Ford F150. Had my heads rebuilt, new camshafts, lifter and followers. On intial startup it ran good for about 10 seconds and quick began to make a lot of noise. Shut it down and took it back apart. Upon inspection I found the timing marks on all 3 sprockets had jumped way off their marks. I had 2 collapsed lifters and it had scored my new camshafts. I replaced the lifters set the timing marks again according to manufacters and oem shop manual specs and reassemble after I had my technician double check my work. I started the engine with the same result but this time it quickly overheated and started knocking after running smooth for less than a minute. I once again dissassembled the engine to once again find the timing marks to be way off from where I set them. I turned the engine over by hand several times and witnessed the chain slck up just before coming around the crankshaft get and skip a tooth as it came around. I then proceeded to remove the gears and measure them with my digital calipers and found the crankshaft gear was not exactly half the diameter of the camshaft gear. Half the the amount of teeth but not half the diameter making it not an exact 2:1 ratio therefore it skipped a link ever revolution with nearly 3/4 of an inch difference in diameter its not hard to determine these parts are completely wrong. Being an interfence motor this was devastating to me and my now enraged customer. I now have completely tore down the motor to discover bent valves, broken pistons, damaged camshafts, more collapsed lifters, a damaged block and a customer that I am now have to supply a rental car for. Amazon here tells me they will give a refund for the timing kit and thats all. Not happy at all.