LS6 Block
08-04-2013, 11:10 AM
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If your are referring to a MK IV 454, back in the day, they are either 2 bolt main or 4 bolt main. The LS6 like in a 70 Chevelle or Corvette are 4 bolt main, most all other production blocks were probably 2 bolt main, there could be some truck motors that were 4 bolt but I can think of any right off the top of my head. Now the newer style GEN V and GEN VI are all 4 bolt main.
