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Stijn
The 'head stud' pulling problem really started with the 2.7 74 US Motors (you'll notice that 2.7RS Carreras didn't really have this problem). I'm of the opinion that it had more to do with the additional exhaust requirements in the US (causing higher op temperatures) than just changing to Nikasil.
Nikasil is far superior to Biral in wear and frictional characteristics, What year is your car? you say 73 but I would have expected a 7R not 5R case. I see you have pistion
squirters installed, what make are the nikasils?
Either way if you want to keep the original 2.4 displacement
I'd not fear using nikasils (also re-attach the heater!)
If it is a true '73S I'd be reluctant to take it out to 2.7 it is
the best and most valuable (next to a 73RS) early road going
911 and it would be a shame to hot rod it
HTH
Neven
73 911E
Easiest way to check for inserts (if its not obvoius) would be take a stud out and use a magnet (the case is mag the insert steel)
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