Ok, so I dont own a caddilac, But I do own a 4.9 pfi from one. It will be transplanted into my 86 fiero. I have come here to learn all about the 4.9. All I can tell you about the engine is that it has a double wire oxygen sensor, so that would make it an obd 2 computer system right????? Making it a 95?????? not sure how caddy runs things, thats why im here.