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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 5,760
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Check your flanges with a file. If the file easily cuts the flange, it is not hardened. If it tends to skip or not cut, then it's hardened. Then you will know how difficult it will be to drill through. I don't think the flanges are hardened, although the spline part may be.
For sure, the CV joints are hardened.
I will ask the same question Jeff did: Why do it? If you have to do custom work, it might be better to use different CV joints and flanges.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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