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Old 06-14-2021, 11:27 AM
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Default Intake gasket moved

Been down on power this year. Checked almost everything. Last outing developed a vacuum leak. Traced it to the intake gasket. What a surprise when I pulled the intake off. The gaskets moved into the ports. When I put it together 2 years ago, I used gasket adhesive on the intake and dropped it on the engine. It looks like I over tightened the intake. I think I will use a light coat of silicon this time and not over tighten the intake bolts.

I have been down mph, now I know why. It still went 9.97 with a 1.34 60'
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Old 06-14-2021, 11:46 AM
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I'd say it loosened up after 1st install?
I'd put the adhesive on the gasket to head surface instead.



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Old 06-14-2021, 11:47 AM
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Is your water crossover separated from the intake?



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Old 06-14-2021, 11:58 AM
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yes, water crossover is separate. It was a Tin Indian intake gasket.

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Old 06-14-2021, 12:03 PM
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What kind of adhesive?

Used to be I would glue the gasket to the head, then put a little grease on intake side if I knew I'd be changing often.


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Old 06-14-2021, 12:10 PM
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I used high tac gasket adhesive. Don't remember the brand. I am probably going to try a light coating of silicone on both sides this time.

I do remember looking down the intake after installation and all the ports where lined up with no gasket intrusion.

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Old 06-14-2021, 01:07 PM
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I silicone my intake gasket to the head, ive never had a problem with it moving. I use whatever silicone i have........normally permatex ultra.


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Old 06-14-2021, 03:50 PM
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If you take some extra time and since you have the old gaskets here what I have done to facilitate swapping manifolds at the track, but it will also allow you to drop the gaskets in place and not use any sealer as I have should you choose to do so.

Take the gaskets you want to run and bolt them down to the heads with washers, just tight enough to hold them well.

Next cut some of your old gasket up in such a way that it sits in place above the valley cover and below the paired intake runners to support the intake gasket.

When you get good fit then remove the intake gaskets and silicone those 4 spacers in place and let it set up over night.

Come the next day your set to just plunck the gaskets and intake on, and now if you want to play around at the track it’s a breeze!

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Old 06-14-2021, 04:47 PM
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You could put the gaskets on and tighten the intake, let it sit overnight. Next day take intake off and look at the impression on the gasket. That would show if there are any spots not being tight. (should be even compressed material)


I have had the valley tray interfere with an intake and not let it seat fully.



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  #10  
Old 06-14-2021, 05:24 PM
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I use the china copy of the Felpro from ebay, and belt-sand the gaskets to match the ports.

Divider gets thin real good and has stayed put.

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Old 06-14-2021, 08:33 PM
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Checked the heads with a straight edge, perfect. Checked intake with long file, perfect. Set intake on with no gasket and mates flat to the heads. I put it back together using light silicone on both sides. Checked the ports with a bore scope and everything looks good. I will pull the carb from time to time to check with the scope.

What I did notice is the old gasket was still glued to the intake where it should be. The gasket delaminated and the head side moved. Don't ask me how or why but that's what I found. Almost looks like fuel softened it. We will see how long this one lasts.

Going to a gamblers race tomorrow night. Curious to see how much faster it will be.

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Old 06-15-2021, 11:23 AM
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I quit using those gaskets years ago . Fel Pro 1233 now, and have even reused them .

  #13  
Old 06-15-2021, 12:31 PM
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I had the same issue with my tin indian gaskets as well, initially i though it was because i had them doubled up because of my intake being machined way down, and didnt have enough compression to hold it in place? So i went back to using a single gasket and glued to head on divider area.

I had a guy locally scan an intake gasket and laser cut me a few sets and glue those to my intake. These would be nice to have a small groove milled and have an embedded rubber so they are reusable.
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Old 06-15-2021, 01:00 PM
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Quote:
Originally Posted by Bill Eveland View Post
I had the same issue with my tin indian gaskets as well, initially i though it was because i had them doubled up because of my intake being machined way down, and didnt have enough compression to hold it in place? So i went back to using a single gasket and glued to head on divider area.

I had a guy locally scan an intake gasket and laser cut me a few sets and glue those to my intake. These would be nice to have a small groove milled and have an embedded rubber so they are reusable.
I use Tin Indian intake gaskets (I just ordered a set).


GTO George

  #15  
Old 06-16-2021, 09:47 AM
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Send a sample of your gasket to Cometic.They can make an exact duplicate in a material that has metal mesh in the middle.Have done several like this for engines that had intake gaskets walking.

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Old 06-16-2021, 10:19 AM
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Car is back to where it should be. Picked up 3 mph on the top end, from 131 to 134. 60's remained the same at 1.34. Last outing it ran 9.97 at 131 with bad intake gasket. Last night I added 110lbs of ballast to keep the car in the 10's and ran 9.95 at 134. Lost first round with a .005 light, 9.98 on the brakes on a 10.00. Need practice at the stripe.
Car is only legal to go 10.00. No cage cert or license. Time to start playing with restrictor plates again. Car is set up for 10.0 index racing but i do bracket race also.

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Old 06-16-2021, 07:02 PM
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Did it ever backfire- sneeze on a cold start, that could kick the gasket like that.

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