Claude - the rules are a little bit fuzzy in this area, but a good rule of thumb is that the certification follows the year of manufacture of the engine or of the rest of the car, whichever is NEWER. What that means is that if I wanted to put a 1999 Ford 4.6L modular engine in my 1971 Mustang, the car would have to meet 1999 emission standards. If I wanted to take the 250cid I6 in my 1971 Mustang and put it into a 1999 Mustang, the combination would still have to meet 1999 standards. This includes any OBDII standards. There are some onsiderations made for cars that are obviously not for everyday use such as race cars and some street rods. Mike -----Original Message----- From: CBL302@xxxx [mailto:CBL302@xxxx] Sent: Friday, August 31, 2001 6:25 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] RE: Re: GM Engine/modifying your Delorean 12 Date: Fri, 31 Aug 2001 09:22:15 -0400 From: "Marc A. Levy" <malevy@xxxx> Subject: RE: Re: GM Engine/modifying your Delorean >On the other hand, if this was a $6000 conversion Richard would >quickly >have a few hundred DeLoreans outside his shop waiting for Notrhstar >engines.. :) I may be wrong on this (because of the age of our Deloreans) would not the "Feds" bust them for Emissions tampering/modifying from stock,