i have a 89 cadillac deville with the 4.5 v8. i was wondering what head years are interchangeable to my engine.
thanks
Shane

 

I know for a fact that Cadillac made no changes to the drivetrain from 88-89, and adding the multiport in 90 didn't change much even in intake configuration (even the injector pod mounting holes were still present). So it's safe to say that using any heads off of 88-90 will be ok.

 

Nice information i got from this thread.Actually i am also a mechanic of the Vintage cars and also done the home projects so its very helpful for me in my professional field.