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98 Lumina in need of an engine swap

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  • 98 Lumina in need of an engine swap

    I've got a '98 Lumina that needs a new engine. I'm thinking 3400 and have read the downloadable swap guide. Everything that I see in there seems very easily do-able. I'd like to do a 3500 swap as I can get one of them dirt cheap, but it seems that you have to buy a different throttle body, the external crank sensor, and a different set of manifolds to line up with the stock exhaust. Is there any workarounds for not buying these items? This is a junk yard slap together just to see if I can get it to work, not a high dollar driver.

  • #2
    You can use your exhaust manifolds, but you need a 3400 upper with throtle body. This would be the cheapest way. you still need the external crank sensor. You also need to tap the lower intake to except the older ECT sensor or there are some ohter way to deal with this also. but I think taping it is the easiest.

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    • #3
      Originally posted by 95Grand-Am View Post
      You can use your exhaust manifolds, but you need a 3400 upper with throtle body. This would be the cheapest way. you still need the external crank sensor. You also need to tap the lower intake to except the older ECT sensor or there are some ohter way to deal with this also. but I think taping it is the easiest.
      So I can go 3500 engine, 3400 upper with the 3400 throttle body (which is easy to mod to use the 3100 throttle cables etc), 3100 manifolds (which will allow me to use the existing exhaust). External crank sensor, tap the lower intake for the older ECT sensor and I'm good to go.

      Here's what I'm thinking cost wise

      3500 engine: $300
      External Crank Sensor: $150
      3400 Upper intake: $50
      3400 throttle body (if I can't get the yard to include it in the intake): $25
      Upper intake gasket set: $20 from wot-tech

      Roughtly $550 gets me a '98 lumina sporting a 3500
      I bought the car for $150 bucks, so $700 all told

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      • #4
        If I go 3400 I can get one of them from a 2000 grand am complete for $425, or go back a few years and get one from a Venture for $250 (less the timing chain and cover). I'm really thinking the 2000 grand am engine and then take the extra $125 to buy a wot-tech manifold.

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        • #5
          u could also use the 3500 upper and just get a tb adapter from wot-tech to use a 3400. and the 3500 should have metal upper intake gaskets u can just reuse. i tapped my lower no problem also, jusy put it where it is on a 3400.

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