Rocker shaft nut size 911

[flmont]

I need to get the correct hex head size to loosen the nuts on both ends of the rocker shaft on a 81 911 Thanks Frank

[rennworks]

Frank, the large side is 8mm and the other is 5mm

[JFairman]

Also, the 8mm allen wrench needs to be short or cut shorter on the business end to fit into the recess on the front and rearmost cylinders.

A 1/4" drive 5mm hex socket on 1/4 " ratchet or breaker bar works best on those. If you can't find one of those easily you can cut a short piece off of a 5mm allen head wrench and slide it, or glue it, or braze it into a 5mm 1/4" drive socket and use that.

[flmont]

Hey Great ...Thanks so much for the info,..I tried every size and could'nt seem to get a good fit...now I can get back on the road !!!! Frank