Quote:
78-86? 911
87-89 911
89-94? 964
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all valve guides
all head studs older is more likely to have an issue
'78-89 disintegrating rubber clutch centers
'90 up dual mass flywheel
'89-92 head gaskets
'89 up cyl base seals
'78-83 exploding air boxes, earlier is more likely to have an issue
'78-83 chain tensioner issues
'78-80 oil pressure issues in track use