| New Intake suggestions [message #173072] |
Tue, 12 June 2012 09:59  |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
|
Senior Member |
|
|
Oh well I found the dreaded crack in the intake as I had the block off plates already and the Mondello tray. My wonderful wife said order the new one. So now 600 plus dollars later any great advice on the install? I have already pulled the old one. What sealants worked best (I have the Ultra black and the High Temp red Permatex). Best method for holding the new gaskets in place? Any suggestions would be greatly appreciated.
Charley Harris
Magnolia Texas
1976 Edgemont
|
|
|
|
|
|
| Re: New Intake suggestions [message #173081 is a reply to message #173072] |
Tue, 12 June 2012 10:40  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
|
Senior Member |
|
|
| Charley wrote on Tue, 12 June 2012 09:59 |
Oh well I found the dreaded crack in the intake as I had the block off plates already and the Mondello tray. My wonderful wife said order the new one. So now 600 plus dollars later any great advice on the install? I have already pulled the old one. What sealants worked best (I have the Ultra black and the High Temp red Permatex). Best method for holding the new gaskets in place? Any suggestions would be greatly appreciated.
|
If you have or are going to install FI, be careful of the sealant that you use...some are not sensor safe.
In addition, I would not use the rubber gaskets that are included in the gasket set for the front and rear of the manifold. Instead, clean the surfaces throughly. Then lay down a 1/4" or thicker bead of Silicon sealer on the block, putting a extra dab in each of the four corners. No sealer on the gaskets for head to manifold. Then stand over the top of the engine and very gently lower the manifold on to the heads/block, eyeball lining up the bold holes as you lower it. Then put the bolts in and finger tighten only. Allow sealer to set over night. Then torque to spec the next day. This will add another day to the process, but it then acts like you are compressing a "O" ring and likely that it will never leak. In my experience using silicone with the gaskets provided for the front and rear of the manifold, will make the gasket actually squirt out from under the manifold, leaving a big hole for a leak. If you insist on using the gaskets anyway, do not use sealer accept in the four corners. Just my experience with doing these things....
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
|
|
|
|
| Re: New Intake suggestions [message #173100 is a reply to message #173072] |
Tue, 12 June 2012 14:11 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
|
Senior Member |
|
|
| Charley wrote on Tue, 12 June 2012 07:59 |
Oh well I found the dreaded crack in the intake as I had the block off plates already and the Mondello tray. My wonderful wife said order the new one. So now 600 plus dollars later any great advice on the install? I have already pulled the old one. What sealants worked best (I have the Ultra black and the High Temp red Permatex). Best method for holding the new gaskets in place? Any suggestions would be greatly appreciated.
|
Charley,
I just did this. I highly recommend that you call Dick Patterson:
http://www.paterson-gmc.com/
Get his gaskets (Jim K sells them too) and get the instructions for installation right from the horse's mouth. Dick will give you very detailed instructions on how to properly install the gaskets, what sealer to use, where to use it, etc.
Here is a link to a photo album I did on mine:
http://www.gmcmhphotos.com/photos/g6089-gary-rockwell-aluminum-intake-manifold-installation.html
There are other people on this forum that can help as well. Good luck.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
|
|
|
|
| Re: New Intake suggestions [message #173140 is a reply to message #173072] |
Tue, 12 June 2012 22:34 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
| Charley wrote on Tue, 12 June 2012 07:59 |
Oh well I found the dreaded crack in the intake as I had the block off plates already and the Mondello tray. Best method for holding the new gaskets in place? Any suggestions would be greatly appreciated.
|
Sorry if I sound like a broken record but I am going to paste in a comment I made on this topic a few months ago. I would at least check the gasket against the _manifold_ rather than the head. There is lots of head material and much less manifold material at the mating surfaces.
Earlier Comment:
Dick's kit is excellent. I, however would caution those installing a Rockwell Aluminum. Love my Rockwell, but my manifold will fail if you "hang" the gasket on studs or center it on the ports of the heads. The gasket will completely miss the aluminum mating surface. (7+ quarts in 400 miles.) I was so low on oil by the time I go to the Rose Parade I was dropping pressure (0) every time I put on the brakes. That was after 260 miles. Scary when you cannot find anywhere to pull over for blocks.
The lower(cam side) mating surfaces of the aluminum ports have measurable less surface against the head when compared with cast iron. I had to enlarge (egg) the holes in the gasket to center the gasket on the intake ports. I used Right Stuff to attach the gasket to the manifold.
Here is a picture. Look closely and you can see that the gasket is centered on the ports, but you cannot see the entire bolt hole in the aluminum. The tighter the bolt holes in the gasket, the more gasket you have to wallow out.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=43838&title=aluminum-intake-gasket&cat=500
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
| Re: [GMCnet] New Intake suggestions [message #173149 is a reply to message #173140] |
Wed, 13 June 2012 00:21 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
G'day,
Quite frankly if I were installing the RPM manifold, I'd get some 0.040
gasket material and make the gaskets myself.
Regards,
Rob M.
-----Original Message-----
From: George Beckman
like a broken record but I am going to paste in a comment I made on this
topic a few months ago. I would at least check the gasket against the
_manifold_ rather than the head. There is lots of head material and much
less manifold material at the mating surfaces.
Earlier Comment:
Dick's kit is excellent. I, however would caution those installing a
Rockwell Aluminum. Love my Rockwell, but my manifold will fail if you "hang"
the gasket on studs or center it on the ports of the heads. The gasket will
completely miss the aluminum mating surface. (7+ quarts in 400 miles.) I was
so low on oil by the time I go to the Rose Parade I was dropping pressure
(0) every time I put on the brakes. That was after 260 miles. Scary when you
cannot find anywhere to pull over for blocks.
The lower(cam side) mating surfaces of the aluminum ports have measurable
less surface against the head when compared with cast iron. I had to enlarge
(egg) the holes in the gasket to center the gasket on the intake ports. I
used Right Stuff to attach the gasket to the manifold.
Here is a picture. Look closely and you can see that the gasket is centered
on the ports, but you cannot see the entire bolt hole in the aluminum. The
tighter the bolt holes in the gasket, the more gasket you have to wallow
out.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=43838&title=aluminum-i
ntake-gasket&cat=500
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
