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273 DUAL 4 intake- can I use this on NEthing else? pics #232625
02/22/09 03:42 PM
02/22/09 03:42 PM
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Cambridge Idaho
RUMBLON Offline OP
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I bought this today from a buddy. Its a 273 manifold that I really dont need. However it will make a nice shop decoration if nothing else. But I was considering building a 318 or 360 for the 38 Plymouth business coupe and thought it may give it a nice look.

I dont want to spend the $$$ to build a 273 for it as 360s here are very cheap.

I know some of these can be used on 318s, ect but also know or heard that the early ones can not. I dont have a 318/ 360 here at this time to check it on.

Any ideas. The part # is 5488 and its an Offey???

here is a pic or two.

Dave

5044452-DSCF6608.JPG (133 downloads)
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232626
02/22/09 03:43 PM
02/22/09 03:43 PM
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Cambridge Idaho
RUMBLON Offline OP
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5044462-DSCF6609.JPG (101 downloads)
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232627
02/22/09 03:45 PM
02/22/09 03:45 PM
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Cambridge Idaho
RUMBLON Offline OP
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5044463-DSCF6610.JPG (78 downloads)
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232628
02/22/09 03:50 PM
02/22/09 03:50 PM
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Today? Who Knows?
1_WILD_RT Offline
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The angle of the bolts attaching the intake to the cylinder heads was changed in 65...Try bolting it up to your 318/340/360...If the bolts fit your good if not it's early...

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: 1_WILD_RT] #232629
02/22/09 03:54 PM
02/22/09 03:54 PM
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Holland MI Ottawa
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2boltmain Offline
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The bolt holes are in the same location just angled differently. You can swedge out the holes to the angle you need. You may need to make angled bushings to locate and support the bolts. no biggie. People do this currently to fit an LA intake on Magnum style heads. That intake will work better on 318 heads- it was originally designed for a hot 273 then 318 application.

5044489-dualQ2148kb.jpg (68 downloads)

Keep old mopars alive.
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232630
02/22/09 04:53 PM
02/22/09 04:53 PM
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Kalispell Mt.
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HotRodDave Offline
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Looks like it has the 273 only bolt pattern. To use it on anything but the 66 and older 273 heads you have to wallow out the bolt holes a little. It has the small ports that match 318 heads and you could open them up to use on a 340 or 360 head along with the bolt hole mod.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: HotRodDave] #232631
02/22/09 05:18 PM
02/22/09 05:18 PM
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Cambridge Idaho
RUMBLON Offline OP
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OK, so if I decide to build a 318, I can wallow out the holes a bit, I would guess I would use some sort of washers and that would hold well enough on a 318? So 360 heads are different? All I own is a 340-6 pack and then big blocks.

Now, if I am going to do this, are there some good sites for hotrodding a 318 and what size carbs would I need to look for, and older or new and WHAT????

I want to make the 38 a real driver, what would you suggest?

Dave

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232632
02/22/09 05:37 PM
02/22/09 05:37 PM
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Central Coast, Calif.
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Snoopy Offline
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It may be cheaper to hang the manifold on the shop wall than to build a car around a bargain manifold.

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: Snoopy] #232633
02/22/09 05:47 PM
02/22/09 05:47 PM
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Kalispell Mt.
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HotRodDave Offline
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I got a nice 318 I am getting ready to sell, could meet you 1/2 way to cambridge if you are interested, PM me.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: Snoopy] #232634
02/22/09 06:00 PM
02/22/09 06:00 PM
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Holland MI Ottawa
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2boltmain Offline
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I advise against trying to bring port size out to 340/360 size. Here is a 360 gasket on my 273 Offy dual quad. If you bring it out to the 360 size you will have near paper thin metal afterward. My suggestion is to run it as is with 2 Eddie/AFB 500s, or go with a single carb set up. Other manufacturers may have left enough meat to grind away but it looks like Offy intended this manifold for the 273.


Keep old mopars alive.
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: 2boltmain] #232635
02/22/09 06:10 PM
02/22/09 06:10 PM
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Holland MI Ottawa
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2boltmain Offline
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Gasket beyond mating surface. The port is just below what gasket you can see.

5044837-offytop118kb.jpg (83 downloads)

Keep old mopars alive.
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: 2boltmain] #232636
02/22/09 08:26 PM
02/22/09 08:26 PM
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NY NY
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340duster340 Offline
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i would leave the ports alone...on the motor it is designed for it will offer the right tuning.

seeing as the intake was designed for a smaller bore 273 IMO it wouldn't make sense to molest a nice intake to fit a 318/340/360.

if anything see if you can get the 273 heads to fit the 318 and then you can run the intake.


1966 Dart GT ...down to only 1 mopar for the first time in 15 years!
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: Snoopy] #232637
02/22/09 08:52 PM
02/22/09 08:52 PM
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Cambridge Idaho
RUMBLON Offline OP
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Quote:

It may be cheaper to hang the manifold on the shop wall than to build a car around a bargain manifold.




Thats probably great advise. I was just wondering if I could get away with one!!!! It looks cool and it will look good in the shop. Now, here is another thing. I have a 67 Dart that I am buying back from a buddy who wants to sell it. I sold it to him for next to nothing a few years back.

How much beef, would one need to build into a 273 to use this and is it worth it?

If I picked this 67 back up, I was thinking cheapo commuter.

Dave

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232638
02/22/09 09:06 PM
02/22/09 09:06 PM
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Garden Grove, CA
OzHemi Offline
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A friend of mine recently built a 273 and used an NOS one of those intakes on it. He used around a .450 lift solid cam in it from memory...along with a couple 500 cfm Carters.. It's just a cruiser engine going into a Ute

(he has about a half dozen small block dual quads saved up think one is going to go onto a 340 he has eventually too...just for looks more then performance really)

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: OzHemi] #232639
02/22/09 09:18 PM
02/22/09 09:18 PM
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ILLINOIS
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volaredon Offline
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273s and 318s used the same heads---- port size and all.

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: RUMBLON] #232640
02/22/09 11:01 PM
02/22/09 11:01 PM
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Mesa, Arizona
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Quote:

I bought this today from a buddy. Its a 273 manifold that I really dont need. However it will make a nice shop decoration if nothing else. But I was considering building a 318 or 360 for the 38 Plymouth business coupe and thought it may give it a nice look.

I dont want to spend the $$$ to build a 273 for it as 360s here are very cheap.

I know some of these can be used on 318s, ect but also know or heard that the early ones can not. I dont have a 318/ 360 here at this time to check it on.

Any ideas. The part # is 5488 and its an Offey???

here is a pic or two.

Dave




Why not a 273. Really not much to build one unless you want to spend the $$ on forged pistons. You can get a good street CR out of the 2bl motor with a little machine work. As far as the manifold that's what is on my motor that I posted pics here.

5045619-273LongBlock (108 downloads)
Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: dart4forte] #232641
02/22/09 11:24 PM
02/22/09 11:24 PM
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Cambridge Idaho
RUMBLON Offline OP
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Quote:

Quote:

I bought this today from a buddy. Its a 273 manifold that I really dont need. However it will make a nice shop decoration if nothing else. But I was considering building a 318 or 360 for the 38 Plymouth business coupe and thought it may give it a nice look.

I dont want to spend the $$$ to build a 273 for it as 360s here are very cheap.

I know some of these can be used on 318s, ect but also know or heard that the early ones can not. I dont have a 318/ 360 here at this time to check it on.

Any ideas. The part # is 5488 and its an Offey???

here is a pic or two.

Dave




Why not a 273. Really not much to build one unless you want to spend the $$ on forged pistons. You can get a good street CR out of the 2bl motor with a little machine work. As far as the manifold that's what is on my motor that I posted pics here.




John, nice looking motor. What kind of HP will it put out? And you used the stock pistons and rebuild kit???

I know nothing of 273s.

Dave

Re: 273 DUAL 4 intake- can I use this on NEthing else? pics [Re: volaredon] #232642
02/22/09 11:46 PM
02/22/09 11:46 PM
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Kalispell Mt.
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HotRodDave Offline
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Quote:

273s and 318s used the same heads---- port size and all.




Sort of

64-66 273 had a weird intake bolt anfle but the same ports and other bolt patterns and they were small closed chambers. I think they were a 315 casting#.

67 318 and 273 both used a 920 casting head that was closed chamber and virtualy identicle to the 315 except the now more common intake bolt angle.

68-69 they again shared the same head and it was an open chamber head that except the casting number and AIR ports was pretty much unchanged til the 302 casting in 85


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 273 DUAL 4 intake- can I use this on NEthing else? [Re: HotRodDave] #232643
02/23/09 12:32 AM
02/23/09 12:32 AM
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renton, Washington
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before you RUIN IT..sell it to someone who needs/wants the correct intake for his 273.. they arent really rare but still..everyone ruins them by hogging the holes.. just think about it.. dan

Re: 273 DUAL 4 intake- can I use this on NEthing else? [Re: ph23vo] #232644
02/23/09 09:56 PM
02/23/09 09:56 PM
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Bridgeport, WV
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Michael Offline
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Yep,don't ruin that intake. Someone may buy the 273 engine I have for sale and want that intake.

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