Hey I've got a yr2000 996BP with Sil Motor cans ....
Usual stuff with service history relating to mileage and age. Make sure the heads have been off and the rockers have been checked. I didn't do this when I bought mine and replaced 8 rockers and had to get one of the cam lobes polished!!!!!!!!!!!!!!!!! Yes, thats 8!!!
I'm not really sure about the others but lookup Shazaam's posts ....
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