EGAD! I just read my '70 shop manual which references "Bolt-Fan and Pulley to Water Pump" 20 lb-ft. That being said, every one of my Pontiacs in the past has had a stud and nut setup on the fan mount. How long of a bolt do you use?
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'70 GP Model J
462 Butler ported 87cc Edelbrock D-ports
RPM intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers
TH400 13" Continental "Jim Hand Special"
3.50 9" CurrieTrac, 245/45-18 Front, 275/40-18 Rear
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