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Doing an engine swap on a 1988 429 4v out of a b700 bus that is blown and the harmonic balancer of the 429 is bigger diameter and has 3 bolt pattern for the accessory pulleys. The engine we are putting in is a 1995 460 we need either a harmonic balancer with a 3 bolt pattern that fits on the smaller 460 crankshaft or the accessory pulleys with a 4 bolt pattern to fit on the harmonic balancer that came with the 460
 

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yup ,the heavy truck 370,and 429s have the large snout on the crank
 

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redrill the pulleys, buy a ATI dampener,$$ they are 3 bolt. for std small snout, or look for diff pulleys. Prob better off to rebuilt the eng you took out, or get a used one.
 
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