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Slant 6 Intake/Exaust leaks
https://slantsix.org/forum/viewtopic.php?t=13283		 Page 1 of 1
Author:  66_bcuda [ Mon Jun 06, 2005 4:08 pm ]
Post subject:  Slant 6 Intake/Exaust leaks
ok,

i'm looking for a place that can machine/fix my stock intake/exaust to make them stop leaking.

Small leak just rearward of the carb, and not sealin at the exaust joint.

Steve
Author:  '74 Sport [ Mon Jun 06, 2005 4:50 pm ]
Post subject: 
Any good automotive machine shop worth its salt can do that for you. Make sure you have the intake-to-exhaust seal (metal one) centered up and in proper position, then fasten them together with three bolts. Have the shop resurface them together. Hopefully, it won't require removal of much material, and have them pay close attention so they don't grind them down on an angle.

I will warn you that, even though you carefully go through this process, you still may end up with a slight leak. Ask me how I know. :roll: Installed, retorqued properly, using new gasket, mine still had a leak at a couple of the intake runners. I wound up pulling the whole thing off and applied a small bead of high-temp RTV sealant around all ports and re-installed. No leaks now. :lol:

Jerry
Author:  SlantSixDan [ Mon Jun 06, 2005 7:56 pm ]
Post subject:  intake-to-exhaust gasket
That rectangular hard metal gasket that goes between the intake and exhaust manifolds is a real piece-of-junk design. They almost never seal perfectly, and they chew up the mating surfaces (especially with an aluminum intake). The "squeezably soft" crushable composite gasket that used to be available was much better at sealing this junction. I'm looking into having some of these gaskets made up in a modern "Grafoil" composite material (graphite facing clinched to a stainless steel foil or mesh core). It comes in 1/8" and 1/16" thicknesses, and I'm tempted to look into having some of each made.
Author:  66bcuda [ Mon Jun 06, 2005 11:34 pm ]
Post subject:  Sealing...
So, is it too "shortcut" to just rtv the seams now and say goodbye to the whole thing when i upgrade?
Author:  '74 Sport [ Fri Jun 10, 2005 10:27 am ]
Post subject: 
Dan, when are you going to make up some of those gaskets?
Wednesday, I got the new exhaust installed on Aaron's "Dartster", and when I went to pick up the car, the shop owner told me something was wrong with the manifold. As it turned out, it was leaking at the intake/exhaust interface we have just discussed here in this thread.

Aside from breaking everything down (for the third time) and using high-temp RTV on the metal gasket, are there any other options?

Jerry
Author:  SlantSixDan [ Fri Jun 10, 2005 10:48 am ]
Post subject: 
Quote:
Dan, when are you going to make up some of those gaskets?
Can't say! First I have to lay my hands on one of the original composite gaskets (no longer available, though I think I know where I can find one) then take it to the gasket house. No idea what tooling costs will be, minimum orders, etc. It may be economically impossible. Won't know til I try!
Quote:
Wednesday, I got the new exhaust installed on Aaron's "Dartster", and when I went to pick up the car, the shop owner told me something was wrong with the manifold. As it turned out, it was leaking at the intake/exhaust interface we have just discussed here in this thread.
Yup

Quote:
Aside from breaking everything down (for the third time) and using high-temp RTV on the metal gasket, are there any other options?
Nope
Author:  vynn3 [ Fri Jun 10, 2005 12:54 pm ]
Post subject: 
For what it's worth, I've got a Super Six install planned for sometime in the next six months, Dan, so I'd be a prospective participant in the "buy a gasket" program. In fact, I'd probably buy 5-10...

Not to push. I'm just sayin', is all... :)

VM
Author:  64 Convert [ Fri Jun 10, 2005 8:40 pm ]
Post subject: 
I picked up some .125" thick, "space-age", high-temp gasket material from a supplier and made my own using a metal gasket for a template. It works fine.
Author:  argentina-slantsixer [ Fri Jun 10, 2005 10:10 pm ]
Post subject: 
We have that gasket readily avalible down here in argentina! I CAN'T believe you guys don't have a composite steel-graphite intake/ex gasket readily avalible outta the shelf. I mean, you have way more slants than we have... We also have graphoil head/manifolds gaskets, etc etc.
Author:  '74 Sport [ Sat Jun 11, 2005 4:09 pm ]
Post subject: 
Hey Juan,
Can you find out something about the manufacturer, supplier, price, etc., and post it here?

Jerry
Author:  66bcuda [ Wed Jun 29, 2005 5:31 pm ]
Post subject:  Manifold machinins
I'm still looking for someone with experience on this.

I've called two places who sounded...unsure.

I just want it done right the first time.

Thanx,
Steve
Author:  '74 Sport [ Wed Jun 29, 2005 10:35 pm ]
Post subject: 
If you're talking about leaks where both the intake and exhaust bolt up to the head, any shop with a resurfacing maching can fix you up. Take them to him with the manifolds bolted together and have him surface the runners at the same time. That way, they are at the same angle to the surfaces mated together under the carb (where the metal gasket goes). If you have them surfaced separately, the two manifolds may not bolt together properly and seal off at the metal gasket.

Jerry
Author:  66bcuda [ Thu Jun 30, 2005 1:30 pm ]
Post subject:  Machining Manifolds
Thank you.

I was aware of what needs to occur. I have spoken to a couple of local shops, and their responce was that the were concerned about flex in the arms doing it that way. Also ensuring that the angle/relationship between the surface that mates to the head with the surface that mates with the exaust.

If they were "correct and they were just cleaning it up that would be one thing, but since they are starting out wrong and need to be corrected, there appears to be concerns.

Really folks, I know how "simple" and "standard" this may be, but I am simply looking for a name of a shop in the area that has done this before.

Steve
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