Should any type of thread lock be used when fitting these back into the block? 
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ABY S2 stroker (work in progress)
B5 1.8T quattro
B4 2.3 (decommissioned) -
Yes, hard lock for the bolts.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project -
Yes use the permanent thread lock stuff. You're unlikely to want to remove them again for some time.91 Modded 3B
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