Thread: 400 block question?
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Old 03-09-2011, 04:24 AM
  #7  
wrightway
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Join Date: Feb 2005
Location: LAWTON MI
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Originally Posted by JEFF69Z28
509 BLOCK I THINK IS THE WEAKEST OF THE FACTORY 400 BLOCKS.
BECAUSE OF THE 4 BOLT BEARING CAPS.
not all 509s are 4 bolt
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