Aircooled VW South Africa

Quick Question. Maby someone can help me on this on. WHAT is the fret size of an 8mm head studs Is it 1.25 or 1.5. Why i'm asking is, i'm busy building a turbo motor with AS41 casing and this casing had 14.2mm inserts with 10mm heads studs. I'm busy making new inserts out of hi ten steel with 8mm fret in side for 8mm head studs, but before i start tapping, i want to know what size fret it is. BROBLEM is, i don't have a 8mm stud laing around this side now.

could be 1.25 or 1.5, my guess is 1.5 so that is is stronger to handle the torque settings.
you also get M8 x 1 and M8 x 1.75 but lets not confuse things!

Hahahah!!! Thanks Retrobug!!!

Its a std M8 x 1.25mm thread just checked a few I had in my garage now.

Thanks Edmond!! i gave Dave from FFR a call and ask him and he says the same. it is 1.25mm on the 8mm. thanks for the help. on my way to go buy a 3 tap set