Thread: 406sbc motor: Block #3951511
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Old 02-12-2009, 03:25 PM
  #3  
rabiddawg
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DYNO TECH
 
Join Date: Aug 2007
Location: Colebrook Connecticut
Posts: 425
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careful what you do that 4 bolt block is the weakest of the 400 blocks.
at least girdle the mains which could help.
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