This engine should bolt right into your '72 Imperial (same car, hard start, no A/C, right?). The parts off your engine should fit since the block itself is the same. I am pretty sure that the horsepower of block cannot be determined until you explain what all of the other parts of the engine are going to be. If they are off your existing car (heads, carb, camshaft and lifters)the horsepower of it should end up the same as what you have now (other then the differences due to wear and tear). R.V engines may have had additional cooling capacity through heavy duty external components, but the engines should be exactly the same between '71 and '72. Do you plan on replacing your motor because it is hard to start? What other symptoms does your current motor exhibit that would lead you to want to replace it. Those things, if serious could all contribute to your starting problems as well as the white smoke, etc. described in one of your other posts. Paul joel hunter" <thejoel_hunter@xxxxxxxxxxx> writes: >anybody have an idea on the horsepower rating of a 71 413 rv block. im >pondering putting it in my imperial, but what combo of heads or manifolds >would i have to change? > >_________________________________________________________________ >Get tips for maintaining your PC, notebook accessories and reviews in >Technology 101. http://special.msn.com/tech/technology101.armx > > > >----------------- 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 > >