Intake Gasket Woes - Team Camaro Tech
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post #1 of 6 (permalink) Old Sep 21st, 03, 01:08 PM Thread Starter
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Robert
 
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I’ve installed new set of Trick Flow heads and I’m having trouble getting the intake to seal. It’s sucking air and oil from the bottom of the intake runners. I started out with the Fel-Pro 1205 gaskets as recommended. The intake is a fairly new Edelbrock Performer RPM that worked fine with the cast iron heads. I’ve since switched to a thicker Fel-Pro 1245 .120 thick and it’s definitely better but still leaks. I’m guessing there’s some sort of difference in the angles between the heads and intake. Can I use some Ultra Black RTV around the intake ports on intake side of the gasket to make it seal. All suggestions are appreciated.

Robert

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355ci 10:1, 64cc Edelbrocks, Comp Mag 280H, Performer RPM, 700r4 (2000 stall), 3.55 posi A/C PS PDB Hotchkis

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369ci 10.3:1, 64cc Edelbrocks, Voodoo 276/284, Performer RPM, Holley 650DP ...T56 Magnum, 3.73 Moser 12 bolt
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post #2 of 6 (permalink) Old Sep 21st, 03, 01:32 PM
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Mark
 
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RTV will disolve when exposed to gas for a period of time. High Tack is recomended for gasoline but it won't fill too big of a leak

I had similar issues with an intake swap many years ago. I solved it by going back to the manifold that did not leak. Lousy answer, I know but the hassle was not worth the effort to me at the time. You may need to machine the surfaces to ge them true. Find a very good machinist.

-Mark.
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post #3 of 6 (permalink) Old Sep 21st, 03, 03:43 PM
a67
 
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Not a HSR intake by any chance is it?

One thing to do is to use modeling clay and get some impressions. Use petroleum jelly on the surfaces (release agent) and modeling clay for clearances.

Do this on the four corners but at eight points. Top and bottom of the four corner runners. In this manner you will be able to tell how square the manifold is to the head surfaces.

Also do the end rails incase they are hitting and not allowing the manifold to seat.

Bob.
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post #4 of 6 (permalink) Old Sep 21st, 03, 11:14 PM
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could they be 18*heads?those require a different intake manifold.
Let us know!
Eric

86 camaro,383,topline vortecs,scat crank,wiseco forged 9.5:1,6"scat rods,comp xs282s,performer rpm,750 proform vac sec,msd in cap, hooker coated 1 5/8"headers,3"flowmaster,700r4,2800 stall,3.42 10 bolt posi,hotchkiss lca's,aje tube k member & a-arms
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post #5 of 6 (permalink) Old Sep 22nd, 03, 12:15 AM
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Ditto what a67 said. I ran into this a few years ago with a set of rebuilt cylinder heads from a local volume engine shop. I went thru about 12 intake gaskets trying every brand and thickness I could find to get it to seal around the lower edge of the intkae ports. The would seal for anywhere from a few hours to a few days, then go back to leaking. You could actually see in the gasket impression that the mating surface was not square. I ended up swapping the heads and intake for a new set of vortecs and matching performer rpm...over 3 years of use and no leaks. I used that old intake (weaind 8004) on the 305 in my 3/4 ton truck and it is working great. My guess is the rebuilder shop milled the heads too far and caused the mating surface angles to get too far out of whack. In your case, if the block wasn't decked excessively, and a different intake doesn't seal it, then the only thing left is the heads.

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post #6 of 6 (permalink) Old Sep 22nd, 03, 04:11 AM Thread Starter
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Robert
 
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Thanks for the replies. I just emailed Trick Flow to see if they have any suggestions. I have an old Scorpion and a stock Q-Jet intake that I could put on to see how they fit. Right now I can't help but think these heads are out of whack.

Robert

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355ci 10:1, 64cc Edelbrocks, Comp Mag 280H, Performer RPM, 700r4 (2000 stall), 3.55 posi A/C PS PDB Hotchkis

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