There are no torque specs for the motor mount bolts in the 57-78 FSMs.
And there is only one spec in the 79-85 FSM (rear motor mounting bolt-nut: 16 to 24 ft lbs).
For the rest, there is a “General Fastener Tightening Specifications” chart in the 70-78 and 79-85 FSMs. 1)
It lists general torque values for bolt types but not specific mounting bolts.
It also says to torque to these values given in the table unless specified otherwise.
Bolt size | SAE 2 74,000 psi Low carbon | SAE 5 120,000 psi Medium carbon heat treat | SAE 7 133,000 psi Medium carbon alloy | SAE 8 150,000 psi Medium carbon alloy | Socket head cap screw 160,000 psi High carbon quenched tempered | Socket head set screw 212,000 psi High carbon quenched tempered | Studs |
#6 | - | - | - | - | - | 9 in/lb | Use SAE 2,5 and 8 values when grade is known with nut and sufficient strength |
#8 | - | 14 in/lb | - | - | - | 16 in/lb | |
#10 | - | 22 in/lb | - | - | - | 30 in/lb | |
1/4“ | 6 ft/lb | 10 ft/lb | 13 ft/lb | 14 ft/lb | 16 ft/lb | 70 in/lb | |
5/16” | 12 ft/lb | 19 ft/lb | 25 ft/lb | 29 ft/lb | 33 ft/lb | 140 in/lb | |
3/8“ | 20 ft/lb | 33 ft/lb | 44 ft/lb | 47 ft/lb | 54 ft/lb | 18 ft/lb | |
7/16” | 32 ft/lb | 54 ft/lb | 71 ft/lb | 78 ft/lb | 84 ft/lb | 29 ft/lb | |
1/2“ | 47 ft/lb | 78 ft/lb | 110 ft/lb | 119 ft/lb | 125 ft/lb | 43 ft/lb | |
9/16” | 69 ft/lb | 114 ft/lb | 154 ft/lb | 169 ft/lb | 180 ft/lb | 63 ft/lb | |
5/8“ | 96 ft/lb | 154 ft/lb | 215 ft/lb | 230 ft/lb | 250 ft/lb | 100 ft/lb | |
3/4” | 155 ft/lb | 257 ft/lb | 360 ft/lb | 380 ft/lb | 400 ft/lb | 146 ft/lb | |
7/8“ | 206 ft/lb | 382 ft/lb | 570 ft/lb | 600 ft/lb | 640 ft/lb | - | |
1” | 310 ft/lb | 587 ft/lb | 840 ft/lb | 700 ft/lb | 970 ft/lb | - |