I will be putting a 500 in my 77 Deville this weekend. I am going to cut the bolt by the #1 cylinder enough to clear the 500's exhaust manifold so everything should slide right in. My only concern is the exhaust pipe. Will the pipe on the Deville in its stock position conect directly with the 500? I'm hoping to make this swap as easy as possible and don't want to have to take the manifolds off the 425 and put them on the 500.


Thanks!

I have never heard of it being a problem for a 425 to 500 swap. But I can't say for sure. You should be able to make some measurements and figure it out. Please let us know how it goes for you.

I'm not sure if it will line up perfectly of not.
Make sure, before you use the 425 manifolds, that they will completely cover the exhaust ports on the 500 heads.
The 425 manifolds are more restrictive than the 500's. If it was me, I'd modify the exhaust pipe (or have one made at an exhaust shop) to work with the correct manifolds or have duals put on it. :cool:

Did ya do it yet? If so, how did it work out for ya?

Everything's done. I'll be bolting the exhaust to the manifolds tonight and it will be complete.

I will put up a review on my web page this weekend. You guys want the link?

Sure! Post up the link here for us to visit.

Post the link here - please. I need all the info I can get on this swap.

Everything's done. I'll be bolting the exhaust to the manifolds tonight and it will be complete.

I will put up a review on my web page this weekend. You guys want the link?

So did you ever get around to doing this?

I haven't had time to finish my site. Sorry! I will have it up soon, thought.


If you have any questions, I'd be happy to answer them. kevin@penguinonbud.com

Sooooo...