Use the rubber gasket or not? - Team Camaro Tech
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post #1 of 16 (permalink) Old Dec 10th, 16, 03:28 PM Thread Starter
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Use the rubber gasket or not?

I'm getting ready to install the intake manifold on my 327 engine. The gasket kit that I purchased came with two rubber end gaskets and I'd like to know your opinion as to weather I should use these rubber gaskets or not.

If I use a large enough bead of RTV on the ends would that make a better seal? ALso...should I place RTV the entire length of the side gaskets or would a bead around the water jacket holes be adequate.

Thanks in advance for any advice.

1967 Camaro Convertible with a 327, TH350transmission, Edelbrock 1406 600cfm carb, Edelbrock 1721 fuel pump & 2701 intake.
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post #2 of 16 (permalink) Old Dec 10th, 16, 04:29 PM
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Re: Use the rubber gasket or not?

Yes and no.

The manifold should sit about an eighth inch above the China rails (the end of the block that seals the lifter valley) when torqued in place. As such an eighth inch bead will be a better choice because it will resist leaks as well as being blown out better than a gasket and sealant. However too thick of a gob of RTV due to a poor fitting manifold (off shore knock off), or previous machine work such as angle cutting the heads, will open that gap up and result in problems. You don't want that RTV bead to slip and fall inside the engine clogging the oil pick up. Test fit to see your end gap first.

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post #3 of 16 (permalink) Old Dec 11th, 16, 06:17 AM
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Re: Use the rubber gasket or not?

I always just did a RTV bead and like Dave said, test fit first so you can see what you need.

Also, be sure to give it time to cure before start-up

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post #4 of 16 (permalink) Old Dec 11th, 16, 08:05 AM
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Re: Use the rubber gasket or not?

You might find the information in the article at the link below useful. This article is posted on CRG's site along with a ton of great information. Check out the link on that site to JohnZ's Tech Articles for other good information. Hope this helps.

http://camaros.org/pdf/intake_swap.pdf

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post #5 of 16 (permalink) Old Dec 16th, 16, 08:59 AM
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Re: Use the rubber gasket or not?

I use Permatex "the right stuff" .. so far im really liking that stuff..makes great seals.

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post #6 of 16 (permalink) Old Dec 16th, 16, 09:18 AM
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Re: Use the rubber gasket or not?

First thing I do is throw out the cork or rubber end gaskets. Then I use sealer all the way across both ends.

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post #7 of 16 (permalink) Old Dec 16th, 16, 09:27 AM
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Re: Use the rubber gasket or not?

Quote:
Originally Posted by HawkX66 View Post
First thing I do is throw out the cork or rubber end gaskets. Then I use sealer all the way across both ends.
X2 , but remember , if you use rtv , you need to apply a thick enough bead (set intake on block to determine) and you need to allow the rtv to cure, before setting intake on. Read the directions on the tube, you will make a neater seal.
And use rtv same color as engine paint. Looks neater also.

Don
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post #8 of 16 (permalink) Old Dec 16th, 16, 09:47 AM
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Re: Use the rubber gasket or not?

Quote:
Originally Posted by dragon0123 View Post
I use Permatex "the right stuff" .. so far im really liking that stuff..makes great seals.
X2 Works great. Easy to razor blade off if you ever need to.

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post #9 of 16 (permalink) Old Dec 16th, 16, 10:41 AM
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Re: Use the rubber gasket or not?

RTV Ultra Black, and about 1/4" bead for me, I let it set up for about 10 min,then drop the manifold on.


"Permatex® Ultra Black® Gasket Maker
Maximum Oil Resistance RTV Silicone
22072

For Heavy Duty Oil Applications
Ideal for Maximum Gap Coverage
OEM Specified
Sensor Safe"

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post #10 of 16 (permalink) Old Dec 16th, 16, 12:46 PM
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Re: Use the rubber gasket or not?

Lot's of good info and agree especially reading John Hinkley's report but Big Dave brought out a point that has compounded the issue of sealing, that being a poor match up due to the heads being milled, a deck job or whatever so check that out. I Know its bit me many moons ago.

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post #11 of 16 (permalink) Old Dec 16th, 16, 01:57 PM
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Re: Use the rubber gasket or not?

Quote:
Originally Posted by dragon0123 View Post
I use Permatex "the right stuff" .. so far im really liking that stuff..makes great seals.
X3 I used to swear by ultra-black before I found this...

Ultra-clean is important - final clean with lacquer thinner. Roughing up the china walls and corresponding surfaces on intake with 40 grit roloc helps

https://www.camaros.net/forums/18-eng...-straight.html
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post #12 of 16 (permalink) Old Dec 16th, 16, 09:15 PM
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Re: Use the rubber gasket or not?

Same thing for big blocks?
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post #13 of 16 (permalink) Old Dec 17th, 16, 11:16 AM
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Re: Use the rubber gasket or not?

Quote:
Originally Posted by bigblockragtop View Post
Same thing for big blocks?
Yes

69 COPO clone, 461" BBC 11.25:1 Compression
840 Rec Heads (2.25/1.88) AED 850 HO carb
Orig Exhaust Manifolds
Straub (Clay Smith) cam, 288/300 .600/.569 109.
TH400, 3500 stall, 4.11 12 bolt posi
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post #14 of 16 (permalink) Old Dec 17th, 16, 05:31 PM
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Re: Use the rubber gasket or not?

Do not use RTV, it tends to squeeze out the gasket when tightened down. Something like Permatex or 3M weathestrip adhesive.


Vince

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post #15 of 16 (permalink) Old Dec 17th, 16, 07:54 PM
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Re: Use the rubber gasket or not?

I have used the this:

Ultra or the right stuff, the right stuff is tackier and seems to stick better. I use my finger and put done a real thin ski coat on both the wall and the intake and then run the bead on the wall and hand tighten down the intake and wait an hour and then torque to spec, never had a leak yet. I use the same technique for thermostat housings except I use the grey stuff permatex makes for coolant, it is grey and is the chest for the alluminum intakes

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