5.0 and 5.7 Discussion, 307 Rebuild! in Cadillac Engine Discussion; Actually depends on the state you are in. In Wisconsin it is legal to drop in a 455 to replace ...
- 07-31-06 12:06 PM #16
Re: 307 Rebuild!
Actually depends on the state you are in. In Wisconsin it is legal to drop in a 455 to replace a 307, as they are same family (pushing it), as in Olds V8's, But it is ILLEGAL to drop in a LS1 or LT1 or any other engine not in the same FAMILY.
BUT, they also said that with Wisconsin, talk to them, they are very willing to work with hot rodders who are willing to do it right.
Emissions still must be met for the CAR, not the engine! So you can't put in a W30 cam and expect the 455 to get 307 emissions.
I did a 307 to 350 Olds swap and it was a sweet driver. Do not use a larger cam, I eventually put in a 204/214 SSI cam from PAW and it was not so good in the bottom end with the low 8:1 compression my 77 350 with 3A heads had. Moneydello said to go up to no less than 9:1 (take off 0.060" off my heads) to make it better. He was ok with the cam, but the compression was too low to make it work well. And if the cam is that big, step up to 3.08's or 3.42's.
- 07-31-06 06:31 PM #17Cadillac Owners Member
- Automobile(s): 93 Allante
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- Mar 2006
- Northern Virginia
Re: 307 Rebuild!Originally Posted by N0DIH
On the other hand, it IS legal to swap ANY same year or newer engine into a car so long as you also swap the emissions equipment that goes with the engine. That means that you can put a 2006 LS7 into your 1986 Olds (or Caddy - or Mustang for that matter) and so long as all the 2006 emissions equipment is in place and functioning, you'll be legal in the eyes of the feds and the state of CA (and also Virginia, where I live). The bottom line is that you can always swap cleaner, but you can't swap dirtier.Emissions still must be met for the CAR, not the engine! So you can't put in a W30 cam and expect the 455 to get 307 emissions.
Here's an overview from the Calif Bureau of Automotive Repair:
"...engine and emission control configuration...are certified to the year of the vehicle or newer, and to the same or a more stringent new vehicle certification standard..."
Back to my original post - swapping in a 455 is technically illegal but can probably be made to pass.
There is another loophole, by the way. Diesel cars are not subject to emissions testing. Now, in the state of CA (and probably elsewhere), if you convert your diesel car to gasoline you're supposed to install all the emissions equipment as well. The reality is that there's really no way for the DMV to find out...
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