New con rod question?

Discussion in 'Small Block Tech' started by vonhef, Sep 30, 2018.

  1. vonhef

    vonhef Member

    Getting ready to order parts and am looking at using the TA_1630B rods with AutoTec Forged 350 Buick pistons (If my block doesn't need to be bored over .030").

    I noticed that TA says these rods have a wrist pin bushing.... does that mean the pistons use a retainer ring to keep the wrist pin in the piston?
  2. alec296

    alec296 i need another buick

    Yes the B rods should use a retainer ring. The A rod is press pin. Also use a .927 pin(small Chevy) so you would need to specify when ordering piston.
    And your better off with some kind of overbore to true cylinder for best ring seal. 350 can handle pretty large overbore after sonic check. Autotec has custom head gasket for larger overbore.
  3. vonhef

    vonhef Member

    Good deal, I figured the wristpin must of used a retainer with the smaller pins. The reason I specified .030".... that is the largest size the autotech specifies for these forged pistons:

    Thanks for the info!!!
  4. Jim Weise

    Jim Weise 1000+HP

    Call Racetec (autotec) direct.. you can order any size you wish.

  5. MrSony

    MrSony Well-Known Member

    You have to get new pistons anyway, autotec is the same price for any size, might as well spend the extra $200 in machining and have the block trued up.
  6. Mark Demko

    Mark Demko Well-Known Member

    Yep that's what I did
  7. vonhef

    vonhef Member

    Of course! :) The block is currently at standard bore, and it is in the machine shop now to be "trued up".... I just didn't know how large the bore would be. I also didn't know the Autotec pistons were available over .030".
  8. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Have you considered 0.020" oversize?
  9. Mark Demko

    Mark Demko Well-Known Member

    I called Auto-Tec direct and they made mine in .040 over with thin rings and 11 to 1
    They'll make to any spec you need.
  10. vonhef

    vonhef Member

    Sure! But the cylinders have pitting that will dictate how oversized the machine shop will perform.
  11. vonhef

    vonhef Member

    That is cool! Thanks for the info.
  12. alec296

    alec296 i need another buick

    My autotec pistons are .100 overbore. 1.840 compression height. With .827 pins for custom rods.
  13. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    You have Ross 2618 alloy pistons, not the AutoTec 4032 alloy because you want to use boost.

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