Benzmac, what is the correct spec for the maximum length for headbolts (my '89 300e m103). I've got the head off and I checked in my repair manual. States max length 108.4 mm. I measured all of them and the longest one is 103.5mm. This has got to be a typo, as I can't imagine stretching them to the spec that I have. If you know the correct spec, please let me know. I'm going to replace them, but I just want know what the right spec really is.

Thanks Jeff


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Jeff L
1987 300e
1989 300e
1987 BMW 325

Head bolts for your 89 300E length when new is 105mm max,length is 108.4mm if 108.4mm is exceeded,the bolts should be renew.
cylinder head bolts with collar only mounted without washer starting 11/88.
hope this help.

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MB STARS Master Guild Technician,12 years MB tech
6 years independent shop owner