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Discussion Starter · #1 ·
i am going to change my engine from a 521 to a 583w/rave iam doing this by taking the top end from a 583 and putting it on the bottom end of my 521... i have been told that this will work.. i am wondering if anyone has done this or if there is more to it than just changing out the top end? i was told that i will need a bigger exhaust/ thats fine i bought a parts sled and it came with the exhaust for a 670- any input is welcome.. thanks[thumb]
 
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