C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Upper intake swap

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Old Mar 15, 2009 | 09:20 AM
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Default Upper intake swap

I'm going to switch the upper intake on my 85 L98 and was wondering how long this should take? Scale of 1-10 how hard should this be? This will be my first fuel injection job.

Last edited by snowmanmdp; Mar 15, 2009 at 09:27 AM.
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Old Mar 15, 2009 | 11:17 AM
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Are you removing just the plenum? If so its a piece of cake, there are 4 10mm bolts to remove the throttle body, and 8 torx bolts to remove it from the runners. You also have the distributor cover plate which has 3 screws, the brake booster line at the rear by the distributor, some vacuum lines and a sensor underneath. Shouldnt take more than 15-20 minutes to do.
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Old Mar 15, 2009 | 02:10 PM
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Removing runners too.
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Old Mar 15, 2009 | 02:54 PM
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As long as you're not removing the lower intake and fuel injectors, it's easy. You just have to make sure you don't strip the torx head screws. Those bastards are PITA when they are tight. When you put the torx bit into the torx screw head, make sure it is all the way in before you start twisting. Don't rush it and take your time and never force them loose.
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Old Mar 15, 2009 | 04:48 PM
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Originally Posted by Rogue1
As long as you're not removing the lower intake and fuel injectors, it's easy. You just have to make sure you don't strip the torx head screws. Those bastards are PITA when they are tight. When you put the torx bit into the torx screw head, make sure it is all the way in before you start twisting. Don't rush it and take your time and never force them loose.
Could not get the back bolt on the drivers side Is there a specail wrench to get to it?
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Old Mar 15, 2009 | 04:58 PM
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Label the torx bolts as you remove them, so they go back in the same hole. They are different lengths.
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Old Mar 15, 2009 | 05:00 PM
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Originally Posted by snowmanmdp
Could not get the back bolt on the drivers side Is there a specail wrench to get to it?
Actually, a long extension at the correct angle should reach thru the runners.
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