the key will extend to #1 main bearing so the harmonic balancer has 2in of key to grab instead of a .25in and water pump gear is fully captured (it also only has .25 of the key running it)by the new key way also
as many of these engines as I have been into the crank key is always or close to being sheared off if you shear the dampner side you loose the oil pump as the dampner turns the oil pump if you shear the other end you loose the water pump so this should fix a potential problem
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