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Drive shaft flange bolt question


gretchen/jason

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So im going from 300 horses to about 440 not sure about torque taking a stock 290 horse 310 ft lb of torque sbc doing a balanced roller cam roller lifter stroked 383 with a supercharger .

 

Question is the bolts where the shaft mounts to the diff . Ive been using grade 8 bolts from the local hardware store are these good enough . They fit but have thread the entire length of the shaft of the bolt .

 

Is there a better bolt for this aplicaition ? Ive seen grade 10 but how stong is that as i really dont know ive just been told the higher the grade number the stronger the bolt .

 

But is that for say stretching strength or shearing strength like snaping a twig kind of thing .

 

Jason

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