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    1. #1
      Join Date
      Aug 2006
      Location
      Hampton Roads, VA
      Posts
      678
      Country Flag: United States

      My engine situation (BBC)

      OK well here's the sitrep: My 402 block may be shot, I will know for sure Monday probably after the machine shop gets done with it. It has a big scour in one cylinder wall. The block is already bored over .060. The machine shop is trying to see if we can get by with honing and re-ringing it. They don't want to sleeve that one cylinder by itself because they say it will likely cause overheating problems. (Does that sound right?) So if we can't just re-ring the pistons, I would need to bore the block again and get a whole new set of pistons. That is IF I can go bigger than .060 on this block. They don't know yet.

      If I need a whole new set of pistons anyway, I figure I "might as well" upgrade to a 454 block. There is a guy in my area who has a block and crank only that he wants to sell.

      Assuming I end up getting this 454:
      1. What should I pay for the 454 block and crank alone?
      2. What should I be looking for in the block? (Casting #'s, etc.)
      3. Since I need new pistons, would it be advisable to go bigger and overbore it, and to what bore size?
      4. Can I reuse the connecting rods from my 402 for the 454?
      5. What would it take to make it into a big-inch stroker motor? Is that a wise thing to do for a daily-driven car?
      6. Should I be planning on buying a complete balanced rotating assembly for the build?

      That's a lot of questions, I know, but I am stuck in Italy and my questions about Big Chevy's draw blank stares. It's amazing I was able to find a 454 block here at all. Any advice I can get is like gold at this point...

      1980 Pontiac Trans Am, Chevy Big Block 468, TKO 600 Trans, Hotchkis TVS, Bilsteins, Eaton/Motive 3:73's, 18" Coddington Junkyard Dogs, Nitto NT555 rubber, Autometers http://www.fquick.com/Bandit
      http://www.cardomain.com/ride/2458763


    2. #2
      Join Date
      Sep 2004
      Posts
      135
      Imho, a sleeve done right should be FINE!!

      And be sure to plate hone all the cylinders after installing one as well as have the mains torqued down like stock..

      I think this should all be SOP sleeving a block..

      And I think that Speed-O-Motive is selling as kit options blocks sleeved back to stock so they will have 8 new sleeves installed so they can now run stock sized pistons!!

      pdq67


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