The only "deal" for us is that with 200,000 + miles on our 413 we know it needs a rebuild, and no doubt an overbore. We are just checking our options for pistons. Since it appears that we would pay a serious premium for light weight/original compression pistons, it "sounds" like the most affordable option at this point would be to sleeve the engine back to stock bore and reuse the original ones. Just hope the skirts are not collapsed. Exchange it for a 400?? Not in our lifetime! :o) Bill & Tami Roddick Port Orchard, WA 1964 Imperial Crown 4 DR HT 1972 'Cuda 340 (Tami's Toy) 1988 Cherokee Laredo 1995 Concorde ----- Original Message ----- From: <RandalPark@xxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Tuesday, December 23, 2003 3:51 PM Subject: Re: IML: 413 vs 400 engine swap-Why? > I guess that I just don't get it. Why would someone change from the 413 to the 400 in an old Imperial? I have been following the thread and all of the stuff about interchanging pistons, etc. So far I haven't seen anything that would tell me why someone would want to do this in the first place. Is it more economical? Parts availability couldn't be it since as far as I know there isn't anything easier than an old 413 to get parts for. What's the deal? > > Paul