is there a gasket underneath the valley pan on a 400? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer is there a gasket underneath the valley pan on a 400?

Print Thread

is there a gasket underneath the valley pan on a 400? #1740355 01/27/15 05:44 PM 01/27/15 05:44 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	I went to put an edelbrock 1406 on my stock 400. The eddy is a spead bore and the stock intake is a spread bore. But I didnt look close enough, the spead bore holes on the intake are further apart than the eddy, so the eddy blades are blocked an cant open. Removed the intake. got a basic edelbrock 2186 performer intake and eddy 7225 intake gaskets. As I was cleaning the valley pan for new gasket, I did not see any gasket on the top of the pan, or on the underside. Did Chrysler use paper gasketes on both sides of the valley pan? Cause Im not seeing any gasket material on either side. Also, there are holes in the middle of both heads that are filled with crusted black suit. are these exhaust crossovers? Should I clean them out?

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740356 01/27/15 05:50 PM 01/27/15 05:50 PM
Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas	No gasket. Just RTV on the corners. Wouldn't hurt to clean the heat passages. Screwdriver to break up the carbon while vacuuming it out. Be sure to put some rags over the Valley so the carbon doesn't get inside the engine.

Re: is there a gasket underneath the valley pan on a 400? [Re: stumpy] #1740357 01/27/15 06:18 PM 01/27/15 06:18 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	Would it hurt to put a little rtv or hylomar between the heads and the valley pan?

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740358 01/27/15 06:26 PM 01/27/15 06:26 PM
Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas	If you do keep it a thin swipe.

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740359 01/27/15 06:32 PM 01/27/15 06:32 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: I went to put an edelbrock 1406 on my stock 400. The eddy is a spead bore and the stock intake is a spread bore. But I didnt look close enough, the spead bore holes on the intake are further apart than the eddy, so the eddy blades are blocked an cant open. If you used a thick carb base gasket the 1406 would have worked, at least it does on my LA intake. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: is there a gasket underneath the valley pan on a 400? [Re: Supercuda] #1740360 01/27/15 06:43 PM 01/27/15 06:43 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	Quote: Quote: I went to put an edelbrock 1406 on my stock 400. The eddy is a spead bore and the stock intake is a spread bore. But I didnt look close enough, the spead bore holes on the intake are further apart than the eddy, so the eddy blades are blocked an cant open. If you used a thick carb base gasket the 1406 would have worked, at least it does on my LA intake. Even with a thick gasket the intake still would have left a large ledge for the fuel mixture to travel over and I didn't like that idea

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740361 01/27/15 07:46 PM 01/27/15 07:46 PM
Joined: Jun 2013 Posts: 870 Keizer, Oregon U.S.A. E elmor353 super stock
elmor353 super stock E Joined: Jun 2013 Posts: 870 Keizer, Oregon U.S.A.	If you are putting an aluminum intake on it, I would also install Fel-Pro MS90175 composite gaskets on both sides of the valley pan. The valley pan will seal to the cast iron head surface, but it doesn't like to seal against the aluminum intake surface. I found out the hard way. Massive vacuum leaks around the intake. I used the same valley pan with the MS90175 gaskets to sandwich it and it's been running great for 3years now. Definitely use a little RTV in each corner under the valley pan.

Re: is there a gasket underneath the valley pan on a 400? [Re: elmor353] #1740362 01/27/15 08:33 PM 01/27/15 08:33 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Original Chrysler gasket's,composition completely different than than Fel-Pro,no sealer of any kind other than corners and they don't leak. 8409977-P9020582.JPG (238 downloads)

Re: is there a gasket underneath the valley pan on a 400? [Re: 62maxwgn] #1740363 01/28/15 09:38 AM 01/28/15 09:38 AM
Joined: Sep 2006 Posts: 277 Palmyra, NY 6 63stabamatic enthusiast
63stabamatic enthusiast 6 Joined: Sep 2006 Posts: 277 Palmyra, NY	FWIW in 1970 my new 1970 383 Roadrunner was using oil and was traced to leaks in the intake. The dealer fixed it by putting the 6 pack fiber gaskets on both side of the metal valley pan gasket.

Re: is there a gasket underneath the valley pan on a 400? [Re: elmor353] #1740364 01/28/15 12:53 PM 01/28/15 12:53 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	Quote: If you are putting an aluminum intake on it, I would also install Fel-Pro MS90175 composite gaskets on both sides of the valley pan. The valley pan will seal to the cast iron head surface, but it doesn't like to seal against the aluminum intake surface. I found out the hard way. Massive vacuum leaks around the intake. I used the same valley pan with the MS90175 gaskets to sandwich it and it's been running great for 3years now. Definitely use a little RTV in each corner under the valley pan. Yup. The general rule of thumb: Aluminum manifold? use the add-on paper gaskets. Rick

Re: is there a gasket underneath the valley pan on a 400? [Re: Rick_Ehrenberg] #1740365 01/28/15 01:46 PM 01/28/15 01:46 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	An Edelbrock 1406 is NOT a spreadbore carb. The only Edelbrock carbs that were spreadbores were the Edelbrock Quadrajets. Some of the carter AVS and AFB carbs had larger secondaries than primaries, but they were all squarebore carbs. The only Carter carb that was a spreadbore was the Thermoquad, however they did build some Quadrajets for GM. But your 1406 is a garden variety 625cfm AFB and needs an adapter to work on a spreadbore intake. The Street Demons are the only carbs that fit on either type of base. And the 650 is supposed to be great right out of the box. That's what I'd suggest. R.

Re: is there a gasket underneath the valley pan on a 400? [Re: dogdays] #1740366 01/28/15 09:53 PM 01/28/15 09:53 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	Iv thought the definition of spread bore meant the primaries were smaller than the secondaries, the secondaries were spread further apart

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740367 01/28/15 10:52 PM 01/28/15 10:52 PM
Joined: Jan 2008 Posts: 3,886 Lost and Spaced B bboogieart master
bboogieart master B Joined: Jan 2008 Posts: 3,886 Lost and Spaced	I always thought it meant Spread bore has smaller primaries and larger secondary's. A spread. Square bore being all four bores are the same size. A square. I have mechanical Aptitude. I can screw up anything.

Re: is there a gasket underneath the valley pan on a 400? [Re: dogdays] #1740368 01/29/15 03:58 PM 01/29/15 03:58 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	Quote: An Edelbrock 1406 is NOT a spreadbore carb. The only Edelbrock carbs that were spreadbores were the Edelbrock Quadrajets. Some of the carter AVS and AFB carbs had larger secondaries than primaries, but they were all squarebore carbs. The only Carter carb that was a spreadbore was the Thermoquad, however they did build some Quadrajets for GM. But your 1406 is a garden variety 625cfm AFB and needs an adapter to work on a spreadbore intake. The Street Demons are the only carbs that fit on either type of base. And the 650 is supposed to be great right out of the box. That's what I'd suggest. R. This is the bottom of my 1406, isnt this a spread bore? Secondaries are larger than primaries

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740369 01/29/15 04:21 PM 01/29/15 04:21 PM
Joined: Jan 2007 Posts: 1,668 Mi,U.S.A. M mike s top fuel
mike s top fuel M Joined: Jan 2007 Posts: 1,668 Mi,U.S.A.	1406 is not a spread bore.It does have smaller primaries but that does not make a spread bore. Leave the gun.......take the Cannoli's....Mike

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740370 01/31/15 08:35 AM 01/31/15 08:35 AM
Joined: Sep 2003 Posts: 19,396 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,396 north of coder	Quote: Quote: An Edelbrock 1406 is NOT a spreadbore carb. The only Edelbrock carbs that were spreadbores were the Edelbrock Quadrajets. Some of the carter AVS and AFB carbs had larger secondaries than primaries, but they were all squarebore carbs. The only Carter carb that was a spreadbore was the Thermoquad, however they did build some Quadrajets for GM. But your 1406 is a garden variety 625cfm AFB and needs an adapter to work on a spreadbore intake. The Street Demons are the only carbs that fit on either type of base. And the 650 is supposed to be great right out of the box. That's what I'd suggest. R. This is the bottom of my 1406, isnt this a spread bore? Secondaries are larger than primaries spreadbore think : thermoquad, quadrajet[gm], and some holleys[possibly including the mid 70's "three" bbl.] every thing else is square bore, though some had secondary butterflys slightly larger than the primarys.

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740371 02/04/15 11:04 PM 02/04/15 11:04 PM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	I bought the felpro MS90175 gaskets. Took me a while to clean all the crap off the valley pan especially around the heat exchange openings. Heads needed good cleaning too. Had to use a pointed chisel and hammer to break up the carbon deposits in heat exchange ports. I sandwiched the valley pan, used hylomar on every side of gaskets, and some right stuff rtv on the corners and block edges. Got the aluminum intake on and torqued in order, twice, to 25ft/lbs. The intake came with this plate and gasket. What is this plate for? Is it necessary? or should I just use the single gasket that came with the 1406 carb?

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740372 02/06/15 12:30 AM 02/06/15 12:30 AM
Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA A Adam71Charger OP pro stock
Adam71Charger OP pro stock A Joined: Jun 2013 Posts: 1,521 Tacoma, Washington USA	So the square metal flange is meant to have a gasket on both sides and go between the intake and carb. That was news to me I thought it was just a single gasket

Re: is there a gasket underneath the valley pan on a 400? [Re: Adam71Charger] #1740373 02/06/15 12:58 AM 02/06/15 12:58 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: So the square metal flange is meant to have a gasket on both sides and go between the intake and carb. Correct, that metal square bore piece is mainly used when using a square bore carb (your eddy 1406) on a spreadbore intake cuz the secondary holes on a spreadbore intake are wider than a "square" & the plate covers up that slight mismatch on the secmodary side and that metal piece needs a gasket between it and the intake flange for it to seal (metal to metal would not seal). Some square bore carbs have larger secondary bores than primary bores but if you scroll up several pics you will see that the 4 holes still form a square and the reason that is is with the secondary bores being larger they are closer to each other than the primary bores are (see the pic) therefore are still forming a "square". You need 2 thin paper gaskets and the metal piece or 1 thick/1 thin gaskets (preferred) and the metal piece, the limiting factor being hood clearance and if the carb is too high you need a throttle bracket extension or Andys custom piece. Generally a longer intake path makes more power (inertia of the moving column) and as you know you need the right length of the (4) mounting studs (coarse/fine threads). the eddy needs to be kept cool live every 24 hour block of time like it's your last day on earth

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1