uh-oh: 1990 vs 1991 gasket kit?

[BerniniCaCO3]

Hi!

Just ordered my rebuild kit from northern auto parts

My engine block supposedly came from a 1990 mustang, but of course the guy wasn't sure. I know it's '87-'92 from the pistons at any rate.

Now according to northern auto, their '86-'90 kit is different from their '91-'93, something to do with gaskets.

I ordered the '90 kit, but just called a ford dealer and he thinks from casting numbers (but is not sure) that I might have a '91 block.

Northern auto could not supply any details on WHICH gaskets were different.
I kindof thought all the blocks, heads, oil pans, valve covers, water pumps... I kindof thought everything was exactly the same for years and years

Anyone know what might have been different? If it's just one gasket that isn't even different at all I won't care; if it's one gasket that is different, maybe I'll buy that one gasket from autozone; if it's multiples I might want to send back the '90 kit however....

thanks!
-Bernard

[hypostang]

I did some research and it appears that the kits are mostly the same with just a few minor gaskets that are different

[86VickyLX]

Nothing to my knowledge changed between 1990 and 1991. Blocks are the same. Castings are the same. Any gasket changes are probably not a problem...

[gadget73]

should be no difference that actually matters. The later mustangs, like 94-95 and 92-94 Tbirds had different water pumps and timing covers, but that shouldn't affect you.