Thread: head for a 621 bbc
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Old 07-02-2011, 06:26 AM
  #3  
samitun
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I am greatful for any info,the big M,s have a 410 cc intake runner size,I had them on a 555 and my head guy said they were to big for my engine,thinking they would work for 621 bbc,I know just enough to get myself in trouble....
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