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3/8 grade 8 fasteners need a hair more than 30 ft/lbs IMO.
I would torque them to 38-40 ft/lbs. A lbs or two either way should hurt it. But to work properly they need the Prue load and stretch some..
That fastener should be very similar to a rod bolt. Both are 3/8 and fine thread also, not that makes a huge diff. :two cents:



These are going through aluminum hold downs, and a Harland sharp rocker shaft. I don't want to crush or distort anything, and cause an out of round surface for the rockers.

Kasey



Finally, A mention of distorting or crushing the shaft.

For whats its worth, I have always ran 25 ft-lbs. on shaft studs. 8000 rpm. They lift a little bit, have even bent the shaft between the studs, but never killed a rocker bearing or come loose.
the Harland sharp rockers are particularly sensitive to distortion.

8.30's @3400 lbs