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I am rebuilding my 1984 302. I ordered a procomp timing chain, and it is was to long. I was searching ebay and found true roller timing chains listed. They fit small blocks from 1962 until 3/21/84:doh0715: If my truck is a 1984, how do I figure out the date it was manufactured?

Why would the block change height? Can it be somthing to do with a roller block? Which block is shorter...the early block or the late block?
 
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