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The bolts for the spare blower in my office are M8x1.25, class 9.8, without any sort of obvious necking-down of the fastener shank. This is a bit of an oddball class so I can't find specs in the standard tables, but class 8.8 bolts should be torqued to 18.75 lb-ft, and class 10.9 bolts should be torqued to 27.75. The Lingenfelter instructions specify 20 lb-ft for torquing the "front cover" (snout) bolts, so you should be more than safe (this torque level should not cause the bolts to yield).
I reuse the bolts, FWIW.
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2012 Chevrolet Camaro ZL1 M6 - JRE 650 RWHP kit, AFCO heat exchanger, JPSS V4 aero, Z28 wheels for the twisties and Weld big-n-littles for the dragstrip.
11.193@128.13 in 515' DA |