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Old 09-28-2012, 04:34 PM
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intake manifold installation ? (seals)

im getting ready to install the new manifold i got from a fellow hotrodder and was just curious about the seals and such, my uncle always used rtv sealant or the right stuff for the 2 end seals, he was an old school mechanic so i was wondering if maybe they changed a bit and are better to use nowadays ?

nay or yay?


sealant over the rubber seal things or use what comes in the box ?

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Old 09-28-2012, 04:56 PM
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Sealant..........

Hi,on the front and rear,where those rubber seals were meant to go,i use a center punch,and put punch marks every 1/4 inch across both,then i use blue RTV,usually about 3/16 to 1/4 inch bead,and up onto the manifold gaskets about 1/2 inch,never had one leak...
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Old 09-28-2012, 05:40 PM
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And let the RTV skin up first before you put the intake on.
Skin up!! If you touch it and it pulls off with your finger wait until it drys more. When it's ready it shouldn't stick to your finger and stay put and not squish outta the way.
15-20 minutes should do it.
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Old 09-28-2012, 07:32 PM
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intake manifold installation ? (seals)

I always buy the Fel Pro performance gaskets. Edelbrock recommended the Fel Pro#1211. The gasket kit I purchased is #Q1211. These gaskets have the Printoseal construction. The end seals are cork and you peel the white tape from the bottom of the seals and glue them to the block. I put a thin layer of Permatex Ultra Black RTV around the water ports and a 1/4" bead at the ends of the front and rear seals. I have used the 3M Super Weatherstrip and Gasket Adhesive (yellow)to glue them in place. I have not had any problems with gasket slipping or leaks.
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Old 09-29-2012, 06:37 AM
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Use a 3/8" thick bead of rtv on the ends. Let it skin up for 5 to 10 minutes depending on outside temperature. Don't touch it after you set it down. The only place to push the rtv out of the way maybe down the distributor hole (push it outwards, so the distributor gear will not hit it).

I would also use a thin layer around the water ports on the heads and top side of gasket around the water ports.

To start with, put a little dab of rtv at the head/block intersection before putting on the gasket. This will help hold the gasket in place when you drop the intake on.

1) thin layer of rtv on heads at the 4 water ports
2) dab od rtv at the step when the heads touch the front and back rails.
3) place the gasket. But install the exhaust restrictors on gasket first. Can use a few bolts in the heads to hold up the gasket while the rtv skins up.
4) run the rtv on the front and rear rail. over lap the gasket a little
5) let it dry for 5-10 minutes
6) put a thin layer of rtv around the water ports on the intake
7) drop the intake in place as accurately as possible
8) install ALL the bolts, you may need to use a screw driver to move the gasket around to line up holes. Use a little non-hardening sealer on the bolt threads.
9) tighten from the inside out. (middle bolts to the outside bolts).
10) let it dry 6-8 hours before starting it. The longer the better for the thick rtv.


On that BBC intake. Make sure to use the bypass hose that goes between the intake and water pump. You can plug it but then you would need to use a restrictor washer instead of a T-stat.

Last edited by 454C10; 09-29-2012 at 06:58 AM.
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Old 09-29-2012, 08:01 AM
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This is excellent! The only thing I can add is if I have gasket matched the manifold to the heads, I always stick the gaskets to the heads first with Edelbrock Gasgacinch or Permatex High Tac and let them cure so they won't move around when I set the manifold. With the manifold matched, there is no room for error and a misaligned gasket can screw up the flow.



Quote:
Originally Posted by 454C10 View Post
Use a 3/8" thick bead of rtv on the ends. Let it skin up for 5 to 10 minutes depending on outside temperature. Don't touch it after you set it down. The only place to push the rtv out of the way maybe down the distributor hole (push it outwards, so the distributor gear will not hit it).

I would also use a thin layer around the water ports on the heads and top side of gasket around the water ports.

To start with, put a little dab of rtv at the head/block intersection before putting on the gasket. This will help hold the gasket in place when you drop the intake on.

1) thin layer of rtv on heads at the 4 water ports
2) dab od rtv at the step when the heads touch the front and back rails.
3) place the gasket. But install the exhaust restrictors on gasket first. Can use a few bolts in the heads to hold up the gasket while the rtv skins up.
4) run the rtv on the front and rear rail. over lap the gasket a little
5) let it dry for 5-10 minutes
6) put a thin layer of rtv around the water ports on the intake
7) drop the intake in place as accurately as possible
8) install ALL the bolts, you may need to use a screw driver to move the gasket around to line up holes. Use a little non-hardening sealer on the bolt threads.
9) tighten from the inside out. (middle bolts to the outside bolts).
10) let it dry 6-8 hours before starting it. The longer the better for the thick rtv.


On that BBC intake. Make sure to use the bypass hose that goes between the intake and water pump. You can plug it but then you would need to use a restrictor washer instead of a T-stat.
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