Thread: 421 or 427 sbc rotating assembly in a 400 gm passenger block
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Old 08-04-2009, 06:16 AM
  #15  
oldandtired
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Just another note on the GM400. I have some strange friends that drive in left hand circles. When they build a 400, they use the 2 bolt bottom end because the outer (straight pattern) bolt holes weakens the webbing.

Dave
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