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Hi guys I'm new to this site and have learned a ton from reading old posts about 3406's, my favorite truck engine. I am restoring my '91 Peterbilt 379 EXHD which has a 4MG94654, arr.# 7E-2194, 425 with a OR 6960(?) turbo, and a 7W3906 inj. pump. Also have a 3ZJ21578, arr.# 4P1081, 400 hp in a '92 Ford LTL 9000. Which engine would be better to build for more hp? Is Ynot still available for info? Would like to get 700 - 800 hp but have it reliable too, only driving it myself, has a 18 spd with 46 Rockwell rears. Does Ynot have a build list for either engine in an old thread? Been searching but still have a ton of old threads to read yet
 
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