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1pc or 2 pc rear main?

Discussion in 'The Garage' started by bigbadchev84, Jun 21, 2005.

  1. bigbadchev84

    bigbadchev84 1/2 ton status

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    so what is the difference between a 1pc rear main seal and a 2pc? which is better?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    The one piece mains supposedly don't leak as much , I haven't built the one I scored so I don't know as I haven't owned one in a vehicle .

    The one in my employees 1991 van leaks just as much as any old Chevy :D
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    1 piece is theoretically better sealing-wise, plus many are designed (though may not have) for roller camshafts, which saves a lot of money/hassle/durability issues over aftermarket conversions for non-roller blocks.
     
  4. fortcollinsram

    fortcollinsram 1/2 ton status

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    1pc seals better but is a bigger PITA to change, 2pc doesn't seal as well but is easy to change. If you are looking at a SBC to buy, get the one piece block. Like Dorian said, most of the blocks that have a 1pc RMS are also ready for a roller cam with just a little work. Both my old SBC and my current BBC are 1pc rear mains and neiter one leaked/leaks

    Chris
     

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