Hola Tom Even if you did have the Auto-Pilot, it would not effect the time. It takes less time to remove the passenger's side head than the hard one to get at one the driver's side. With either head you need to remove the battery connection first. Then the intake, the effected exh manifold, the spark plug wires from the plug ends and lay them else where in the engine compartment, the full A/C bracket assembly and lay the compressor with hoses to one side, the effected valve cover and rocker assembly. Now you can pull out the push rods and get to the task of the head. Both heads have a bolt on the hidden rear side with sumthin on it. By myself and common Craftsman tools this is a 4 hour task. If my MoPar neighbor from across the street helps me, its a 5 1/2 hour task. If my brother In-Law helps me its a 2 1/2 task. There is temptation to ream out the valve seats and to install a set of valves that have a larger head diam. Do not listen to the GTX or Road Runner Devil, for your Imperial weighs more. If by chance you have a set of 1972 - 1978 400/440 heads with the last casting numbers of 452, use them. Uncle Rodger & Aunt Gabby Colo Spgs ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm