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84 Bronco, 351 W, C6 Trans.
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Bought a power master alternator and insert in box said to tighten belt to the point that the pulley nut turns the engine.
I can get the belt pretty tight (not even 1/2” slack in belt) but not tight enough to their recommendations. I’ve tried using leverage from up too but still not tight enough by myself.

guess this is a 2 part question.Is broth tight enough if I have so little slack?
If not, any tips to get tight enough on a solo project is appreciated.
 

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I've always tightened them until there was about an inch or less of available deflection, and it's always been good.
Newer serpentine systems only use a spring loaded tensioner.
 
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That's odd. A high compression motor would take a lot more torque applied that way than a stock lower compression motor, making that method of tightening variable at best.
It just needs to be tight enough not to slip. If it's too tight it can prematurely wear the bearings.
You are probably quite good where you are at.

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