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Old 09-07-2019, 01:50 PM
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What are the torque specs for a 400 Pontiac engine mount?

Guys,

Getting ready to install my new Pontiac build into my 70 GTO and I can't find the torque specs for the engine mount to frame bolts. These are the long 5" bolts with 7/16 X14 thread. Anyone have that spec handy?

Mike

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Old 09-07-2019, 04:42 PM
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Plain head, no hash marks, DO NOT USE......JUNK
Hardware grade 5 (3 hash marks), Plain 50 ft/lbs
Hardware grade 5 (3 hash marks, Plated 37 ft/lbs
Grade 8 (Caterpillar for instance, 6 hash marks), Plain 70 ft/lbs
Grade 8 (Caterpillar for instance, 6 hash marks), Plated 52 ft/lbs
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Old 09-08-2019, 08:23 AM
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mount bolt

don't know what that number is...never even thought of looking. just a good tight with a nylock nut.
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Old 09-08-2019, 04:21 PM
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Thanks guys. I wound up looking it up in my 70 GTO factory assy manual. Since these are the (I believe) original bolts I torqued them to roughly the midpoint of the torque range spec...50 ft/lbs.

Mike
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