Quote Originally Posted by industrialfish View Post
05 will have metal gaskets.
Only half of them did, you are lucky if you did get them.

As for the swap, strip the 05 block of almost everything but the heads/timing cover and swap over all brackets and accessories and the L36 top end and it'll drop right in.

And I would never want a caddilac motor in a grand prix, piles of junk. To even think about the swap you gotta know what it takes and would it ever work with the cars engine bay and wiring.