Hi all I need to do a head gasket on my 99 xj8 with a AJ27 motor and I did a lot of searching and this is what i came up with.... Please just tell me if im correct...
1 replace the gasket with a 4.2 gasket its a little thinner but better
2 Felpros head bolts for the Lincoln 3.9 are the same
3 Felpros 3.9 valve cover gaskets are also a go

And what I could not find out is if the intake, plenum, Timing cover, and Exhaust Manifold Gaskets and flange to convertor the same on the 3.9 and can be used on the Aj27 Motor... Please let me know people.... Thanks so much for all your help