I put a 13B rotor housing on my mill and took dimensions of the
tension bolts and the other three bolt holes. I chose to call the top
right hole hole zero and numbered them clockwise. The exhaust flange
is on the right side and the plugs are on the left. I got these
numbers:

HOLE0: 0,0 HOLE1: 1.5374 -0.7755 HOLE2: 2.077 -2.6646 HOLE3: 3.23
-4.5695 HOLE4:3.2108 -6.6415 HOLE5:2.1186 -9.4545 HOLE6:1.0218
-10.3685 HOLE7:-0.7378 -10.932 HOLE8:-2.4868 -10.7575 HOLE9:-4.0164
-9.9565 HOLE10:-5.0822 -8.6915 HOLE11:-5.6008 -7.2725 HOLE12:-5.6270
-5.1825 HOLE13:-5.5442 -3.305 HOLE14:-4.8912 -1.822 HOLE15:-3.688
-0.5975 HOLE16:-1.7306 +0.1215

There are two larger diameter holes 0.630 sized at: 2.137 -10.7255
and also at -6.143-1.851 and there is a smaller diameter hole at
-6.913-10.822 but this last hole is somewhat inaccurate.

Zoltan Szakaly

Outstanding! Thank you.

Josh


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