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#1
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small block factory 4 barrel intake manifold help
i found a factory 4 barrel intake on a 1978 dodge fire truck, complete heavy duty package i believe, 727 tranny, 9 1/4 rearend, with a 318 motor, would you be able to use this intake on a 360, are the intake ports the same as 360 heads, or smaller, if im not mistaken they started to put the 4 barrel option on 318's in the late 70's, with port sizes the same as the 360, needs some info to clear this up.
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#2
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its a clean swap..thumbs up
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#3
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what could i use to block of the egr on the intake
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#4
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You could make a block off plate out of steel plate 1/4 or 3/16 and use a gasket or make one out of gasket material.
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#5
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Plate
I would not use such thick material. Just use two or three thou. shim stock, and place it between the gasket and head surface. No sealing problems if you use some sealant around the water ports.
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#6
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Install the EGR valve and leave it disconnected. The EGR valve operates on vacuum. When theres no vacuum, like at W.O.T. , the valve closes. Leaving the vacuum line off is tricking the EGR valve it's at W.O.T. and keeping it closed.
The floor jets in the intake need to be addressed, thats it. |
#7
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Quote:
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#8
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Drill and tap one, the other use a plug.
Fill with weld is another way. |
#9
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would this factory manifold have poor flow since its an egr manifold, anything you can do to help improve flow.
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#10
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[QUOTE=Monaco Man 78;763460]would this factory manifold have poor flow since its an egr manifold, anything you can do to help improve flow.[/QUO Most folks believe the factory smallblock 4 barrel flows as well as an Edelbrock Performer. I don't think the egr provision makes any difference. I used the block-off plate fix myself, just for neatness , either of the other 2 fixes will work, and I wish I'd thought of pegleg's fix first. Plug the floor jets as noted. I used a common pipe plug to replace the threaded spigot and some JB Weld in the other one. I guess gasket matching might yield a bit, but don't think there's much else to be gained. It's a good piece as built.
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#11
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[QUOTE=dodger1;763482]
Quote:
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#12
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does anyone have pics of there factory 4 barrel intake with block off plates or mods that block off the egr, just curious, thanks.
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#13
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The intake is a reasonable piece good to 5500 rpm+ reguardless of the year or model. The EGR floor jets once blocked off will help. The floor jets should be closed up as close to the floor as possible for best flow. The carb should not suffer any ill effects at all. BUT, carb dependent, and cam used with the carb, the T-Q may need a mod or two.
Click here for some help on a T-Q and ask the author, Demonsizzler for help or a carb he rebuilt/tuned/tweaked for your particual set up. http://www.moparchat.com/forums/showthread.php?t=61792 (I say screw the block off plate and just leabe the EGR valve on and disconnected) |
#14
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i was going to buy a remanufactured thermaquad from summit racing part # 64-1436 from holley, application says 1974 dodge monaco and coronet 5.9 360, also works for big block 400, 440, do you think i would have to modify not sure never bought one from summit.
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#15
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im just curious has anybody used an aftermarket carb, on a factory 4 barrel intake, if so what kind, never really heard about this, since the manifold is setup for spreadbore carbs.
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#16
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IF you get the carb from Summitt racing, you'll have to find out the exact number on the carb. This would tell you the exact application it wa used on. The years list are to far and varried to say OK for use. Again, contact demon sizzler, he has carbs ready to go and for sale.
I have used square bore Carters on the stock intake and there fine, no issues. Holleys may have an issue with the EGR valve and the linkage. |
#17
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would a carb spacer be a good idea for performance on this factory intake if so what height.
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#18
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A spacer is allways a trial and error effort though I'd bet a few bucks a 4 hole 1 inch spacer would help.
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#19
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We have to run the cast iron intakes on the circle track and we have found no problems (ie all the plugs look the same) with running the late model 4 barrel intakes.
I have noticed that some of the 318 intake ports are smaller from the early 360/340 intakes. Be sure that you put a 360 gasket up to the ports before you instal the intake and see if your intake ports are close to the same size as your heads. You might find you have a ton of shrouding of the ports...this is bad! But you can gasket match and gain it back with about 1 hours worth of work. I removed the egr valve and mig welded the holes up in the valve itself. Ground it back flat and used a new gasket and bolted it back on. It's never been a issue for us. I have also used a gasket and made a block off plate and bolted it back down. Same results...So it comes down to how handy are ya! I have removed the floor jets and I have also left them in on other intakes and I can not tell a diffrence between the two intakes! So it's your best guess on running them or not, or if it's worth even jacking with them. I cannot tell any gain on the track. As far as the spacer. It going to be tough to find a carb spacer that bolts to the T/Q mainfold and a T/Q carb. Most spacers only adapt from holley to T/Q or vice versa. I would use the thick intake gasket (1/4") and bolt it down. This will make linkage hook up like stock and you wont have a kick-down problem. Spacers make power up on the top end and have a place on the engine, but this may not be where your engine is ran the most. If you going to stay low in the RPM range, dont mess with it. If your going to turn it up. Stay with the 4 hole design spacer. It will help with fuel distribution. hope this helps John |
#20
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i was up at the salvage today, and i seen what it looks like factory block off plates on two barrel manifolds for egr, flat plates. these were on about five dodge fire trucks i picked up three, it looks factory they had them on most of the trucks dont know just thought i would toss that out there.
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#21
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EGR in itself does nothing to negatively affect performance, in fact it can allow you to run a tad more ign. timing & you may even pick up a bit more mpg, if that matters any. The factory 4bbl intakes are pretty good even if they are heavy. I agree with the above statements regarding looking into purchasing a t-quad thru Demonsizzler vs. getting a reman unit.
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#22
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Val64, I have said that about the EGR a zillion times and have allways been met with negitive statments. It's amazing how people can shove a thumb in the experts and pro's eyes on what is OK and not.
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#23
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I also agree on the EGR, makes sense. Although it seems like it would be tough to get it tuned just right to see any real difference.
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#24
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what thread size pipe plug
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#25
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I read about the EGR valve topic some time ago, & what was said made sense to me & that there really was nothing negative about it other than most people don't want any "smog crap" on their engine if they don't have to. Even the evap systems on some of the early cars before they got carried away with vacuum lines & ported switches, solenoids etc. (GM), is pretty effective @ doing away with vapor lock in carbureted engines. Even though I wouldn't consider myself an "expert" or "pro" at much of anything, I do know how these items function & that they shouldn't necessarily be overlooked especially in a real daily driver type application.
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#26
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There effect is small but added togther it can give the power dept. a hit. Overall, you can still make great power with such equipment insatlled and working correctly.
For a cleaner running car, fine. Theres no real advantage in drivablity with most of the equipment on the engine. Some helps with certain things. Like the charcol canisiter. Helps stop vapor lock. |
#27
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best thing if seen used is a piece of a pepsi can. a mopar mechanic rep told my carb guy that back in the 70,s when he worked in a dealership. cool
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#28
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Huh? Say what?
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#29
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can you put an after market air cleaner stud on a stock thermoquad to put an after market air cleaner if so what size of thread.
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#30
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Yea, stock size
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