Your donations help keep this valuable resource free and growing. Thank you.
|
Correct gasket for Edelbrock Intake |
Post Reply | Page 123 6> |
Author | ||
fmahannah
AMC Addicted Joined: Nov/20/2010 Location: Dahlonega, GA Status: Offline Points: 520 |
Post Options
Thanks(0)
Posted: Aug/11/2011 at 5:55pm |
|
I was reviewing the instructions that came with my #7531 edelbrock manifold, and remembered an issue I had when I initially tried to install it.
The instructions state: NOTE: YOU MUST USE a factory metal valley tray gasket along with the Edelbrock gaskets listed below. If your stock valley tray is in good condition, it may be re-used. 7530, 7531 (None) Edelbrock #7213; Port: 1.13” x 2.21”, .030” Thickness Then in the instructions they say: Apply Edelbrock Gasgacinch sealant P/N 9300 to both cylinder head flanges and to the cylinder head side of the gaskets, allow to air dry, and attach the intake gaskets to the cylinder head, then place the factory metal valley tray into position. All of this led me to think that I had to install BOTH the side gaskets #7213 AND a valley pan gasket. When I tried to do this, not matter how hard I tried the intake would not settle down far enough into the valley for me to line up the bolt holes! I tried several times and after reading on forums of people just using the valley pan gasket, I removed the extra side gaskets and installed just the valley pan like the factory did. This first install did not leak. Now that I am pretty sure I am leaking on the intake and sucking oil, do any of you know if indeed we have to use both the standard side gaskets AND the valley pan when installing an edelbrock aluminum intake? Personally I can't see how that could seal since the side gaskets are thick and the pan gasket is thin, so near the ports you would have both gaskets overlapped, and between the ports and the front and rear seal you would only have the metal pan gasket. Want to make sure I get this right this time, so what do you use when installing an edelbrock manifold, just the valley pan or just the side gaskets or both? Of course RTV or right stuff for the end seals. Thanks |
||
74 Javelin AKA Ghost
|
||
Ken_Parkman
AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Offline Points: 1814 |
Answer Post Options Thanks(0) |
|
I've had one air gap that had too high a casting above the ports on one side, and this excess material bound on the cast protrusion on the head for the valve cover. This did not allow it to sit down on the valley correctly, and there was an internal leak at the intake ports. It acted a little weird, but the real problem was it would suck oil especially after closing the throttle from high load. Machined the top of each side a little and everything was fine.
As for the baffle the air gap is a completely different shape and a stock style baffle cannot be used. To prevent pcv problems you should use the stock valley pan gasket. This combo is clearly not as good as the factory design for oil separation, but it seems to work. I've found the best is the factory system of both the valley pan gasket and the factory intake baffle, but as long as you have either of these things you seem to be OK. But if you have neither be prepared for a smoke show.
|
||
fmahannah
AMC Addicted Joined: Nov/20/2010 Location: Dahlonega, GA Status: Offline Points: 520 |
Post Options
Thanks(0)
|
|
Sorry i forgot that originally I had asked in here about the intake gaskets and was told to just use the valley pan gasket. Old age is definitely creeping up on me.
|
||
74 Javelin AKA Ghost
|
||
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
|
the 7531 if i remember correctly is an air gap intake and if that is true then you dont need the valley pan. the valley pans original function was to keep the heated oil off the bottom of the original intakes. on the 7531 the huge gap between the carb and the lower portion of the intake manifold eliminates the heat transfer to the bottom of the carb, hence no valley pan needed. I use edelbrock gaskets on both left and right sides of the intake and used a bead of RTV on the ends instead of the rubber seals.
|
||
FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
Post Options
Thanks(0)
|
|
Dave ----
|
||
TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
||
Midnight Rambler
AMC Addicted Joined: Jan/17/2011 Location: SoCT Status: Offline Points: 1670 |
Post Options
Thanks(0)
|
|
Just the valley pan, it has the "side gasket" built into it. I also re-used my intake baffle, but as Fuzz said I don't think the Air-Gap allows it. It does let you put some sort of baffle (maybe they provide?) under the PCV - do that.
As for the intake leak, I have an Offy 360 which I bought a Fel-Pro valley pan for. It just didn't want to play nice so I got a Victor Reinz and it fit like a glove. Maybe the Fel-Pro I got was an odd bad one, I don't know. I've had luck with their stuff and I know a lot of guys here swear by them, but if I used the one I had I was pressing my luck. |
||
'66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
||
gd5052
AMC Apprentice Joined: Jun/16/2011 Location: Illinois Status: Offline Points: 108 |
Post Options
Thanks(0)
|
|
Aren't the early baffles thinner than later years ?
|
||
FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
Post Options
Thanks(0)
|
|
Dave ----
|
||
TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
||
billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
Post Options
Thanks(0)
|
|
Do a search - there was a multi-page, really intense in-depth discussion on this exact same topic a few months back with a whole slew of answers and a bunch of great info and opinions.
Please search first. Every answer posted in this thread so far is already here in other threads. |
||
fmahannah
AMC Addicted Joined: Nov/20/2010 Location: Dahlonega, GA Status: Offline Points: 520 |
Post Options
Thanks(0)
|
|
The manifold did come with a baffle for the PCV. They say you must use the valley pan but the instructions make you think you have to use both types of gaskets. I will just go with the valley pan again and this time not use the ultra black which I think is what is leaking. Will go with copper spray and gray around the water ports.
Thanks guys |
||
74 Javelin AKA Ghost
|
||
69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
Post Options
Thanks(0)
|
|
I hate to be the nay sayer again, but please don't pull the manifold without doing the necessary checks for leaks first. Don't get pulled into the parts changer attitude and guess. If a pressure check of the cooling system passed then your manifold is not leaking water. You may still have a vacume leak sucking oil and that could indeed be because you used silicone for a sealent where it is contra indicated. I.E. not where it will be touched by fuel vapors. I use Gel Seal for the ports but there are other non-hardenning products that will work as well. In the earlier thread that you will find in a search, I posted a pic of how to trim the Valley pan so that it can be used with the fiber side gaskets. This is what should be done to prevent the uptake of oil into the P.C.V. system and the valley pan also aids in cam oiling and return of oil to the lower eng. There are many good reasons to use both and few reasons not to. The basic premis is to trim the old valley pan so that the bolt holes and a small tab at each end hold the pan and the ports are left bare fiber gasket for sealing. You put the fiber gaskets on first and then tack the valley pan in place. With the ports and ridges around them cut out there is very little space taken up by the sheet metal. The sheet metal pulls down into the fiber and does not add thickness. Do not use end seals. Use a small bead of the Right Stuff or the like. My offer still stands if you would like to borrow my pressure test adapter for the manifold before you pull it.
|
||
Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
||
Post Reply | Page 123 6> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |