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Old 03-01-2015, 11:31 PM   #1
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Intake manifold

Hey guys. Weird question but can the raised lines on the intake manifold be grinded down and made smooth? It's purely for aesthetics but I think it might look cool. Anyone know if it's possible?


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Old 03-02-2015, 02:11 AM   #2
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Can it be done, yes. I'm fairly certain they aren't just for aesthetics though. They're for structural support of the intake manifold.

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Old 03-02-2015, 06:03 AM   #3
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You could probably fill in the raised lines with something and sand it smooth if thats the look you are going for - but I agree with above - I'm pretty sure those are for support.
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Old 03-02-2015, 06:58 AM   #4
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I might be concerned that by sanding the lines down, the intake tubes themselves may warp from engine heat. I don't know this for sure, but there's a reason they were cast in; I agree with the others that they aid in structural support/strength.

Some folks have ground down a small amount at the top of the runners to allow clearence of a GT strut bar (they got one used for cheap), as these V6 intake lines you talk about prevent the required clearance needed. I do not recall anyone stating that this caused an issue, but again, it was only a small patch that was ground down.
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Old 03-02-2015, 10:01 PM   #5
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You could probably fill in the raised lines with something and sand it smooth if thats the look you are going for - but I agree with above - I'm pretty sure those are for support.

What would you recommend to fill in the gaps?


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Old 03-03-2015, 12:54 AM   #6
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It may be best to find a way to make a cover for it. Filling it in may create problems, or eventually crack. A machinist that can work with thin plastics, might be able to form something. I have suggested something like this to American Muscle.
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Old 03-03-2015, 04:22 AM   #7
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Don't use body filler!!! It will only crack over time. That space is too large and too deep for body filler.
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Old 03-03-2015, 09:32 AM   #8
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What would you recommend to fill in the gaps?


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An epoxy that will adhere to cast nylon. A very expensive endeavor to fill all those squares correctly.


I did 4 squares on my custom ported intake manifolds. I removed the casting pillars out of the middle of the intake manifold. Then used aluminum sheeting and aluminum to cast nylon epoxy to adhere a new square in place. Then I used epoxy for cast nylon to fill those 4 squares in. You also had to do the epoxy in layers (about half a square) let it cure and finish the square. Then sand smooth.
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Old 03-03-2015, 11:09 AM   #9
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1st to suggest the engine cover from the perf pack!
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Old 03-03-2015, 07:15 PM   #10
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1st to suggest the engine cover from the perf pack!

I have it installed but it still shows the intake manifold on the other side of it


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Old 03-06-2015, 05:39 AM   #11
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outside the box idea.....test 1st before doing the entire thing!

as mentioned B4 the ribs are structural and I would worry about epoxy cracking, but how about filling the voids with high temp RTV? I've used it on stove ductwork and it's normally a red color good to about 400 deg. I think filling most of the void would give almost a checkerboard pattern of black and red.
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Old 03-06-2015, 06:31 PM   #12
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I've had the epoxy on my ported intakes for 8 months now. That includes 100+ summer heat and 0-20 degree winter cold. I'm also full bolted on and put my car through it's paces time to time. Not 1 crack, you just have to prep and use the appropriate epoxy for the application.


^^^that same intake manifold will be on my turbo build that's getting ready to take off as soon as I receive the parts this next week.
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Old 03-07-2015, 02:52 PM   #13
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I've had the epoxy on my ported intakes for 8 months now. That includes 100+ summer heat and 0-20 degree winter cold. I'm also full bolted on and put my car through it's paces time to time. Not 1 crack, you just have to prep and use the appropriate epoxy for the application.


^^^that same intake manifold will be on my turbo build that's getting ready to take off as soon as I receive the parts this next week.

Can you post a pic of the manifold? I'd love to see what it looks like


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Old 03-07-2015, 04:33 PM   #14
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The whole manifold is hydro dipped now, all you would see is the 2 smooth squares hydro dipped that I filled on the top of the manifold. The two on the bottom of course you can't see at all.
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