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1991 4Runner with blown head gasket

Discussion in '4Runners' started by ‘91Runner, Nov 28, 2023.

  1. Nov 28, 2023 at 6:20 PM

    ‘91Runner [OP] New Member

    Nov 28, 2023
    1991 4Runner
    3.4 Swap
    I have a 1991 4Runner that I just picked up and Im wondering if I should replace the head gasket or just get a whole new engine. It has the 3.4 swap in it with only 70k miles on the engine. It started up and ran fine when I would drive it and it never over heated. I decided to take the throttle body off and clean it, when I put it back on it would not start and run properly. We figured out there was coolant going in places it shouldn’t. What should I do?
  2. Nov 29, 2023 at 2:18 PM

    NorthPark Well-Known Member

    Aug 24, 2020
    Procharged 4r
    My friend just bought a '70k on the engine' swapped (1998) truck about a month ago. The last I heard he was doing the rear main seal now, after having the heads machined and loads of other work done.

    I couldn't answer you question, but my friend went in thinking it was just a head gasket and it turned into a gigantic time sink and money pit. To me, known working 3.4's that I see for sale in the $1300-1600 range seems reasonable. I see known and proven 3.4 engines sold locally often enough.

    I have a hard time trusting the claimed miles on these swaps when the engine is pushing 25 years old

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