273 Intake Manifold Question!

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Camshaftkid

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Hi all, I've been running into issues locating an aftermarket 4-barrel dual plane intake manifold for my 1969 Dart 273. Even Summit Racing is stumped by this request. I see no advertised 4-barrel intake manifold for this engine, only for the 318/340/360 ci small block engines. I understand there was a cylinder head change after 1966 for the 273, however there is no reference that I have found that indicates I can use the other small block manifold for my '69 LA273. They seem to all advertise for the larger displacements with no mention of the later 273 ci displacement. Please advise. Glenn
 
You can find them. I have a Holley Street Dominator out in the shop with a 273/318 port in it.

I didn’t even know they made the damned thing. I though they all had 340/360 port windows in them.
 
Camshaftkid said:
Hi all, I've been running into issues locating an aftermarket 4-barrel dual plane intake manifold for my 1969 Dart 273. Even Summit Racing is stumped by this request. I see no advertised 4-barrel intake manifold for this engine, only for the 318/340/360 ci small block engines. I understand there was a cylinder head change after 1966 for the 273, however there is no reference that I have found that indicates I can use the other small block manifold for my '69 LA273. They seem to all advertise for the larger displacements with no mention of the later 273 ci displacement. Please advise. Glenn
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They have forgotten about the 273 probably because it was only produced from 64-69 and like you said 66-69 were a normal small block angle and bolt size. You can use any LA intake for a 318-340-or 360 . The 340/360 intakes have larger ports but unless you need everything to be perfect, it isn't an issue.
 
Camshaftkid said:
Hi all, I've been running into issues locating an aftermarket 4-barrel dual plane intake manifold for my 1969 Dart 273. Even Summit Racing is stumped by this request. I see no advertised 4-barrel intake manifold for this engine, only for the 318/340/360 ci small block engines. I understand there was a cylinder head change after 1966 for the 273, however there is no reference that I have found that indicates I can use the other small block manifold for my '69 LA273. They seem to all advertise for the larger displacements with no mention of the later 273 ci displacement. Please advise. Glenn
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273 and 318 have the same size ports in the head. Edelbrock Performer and Weiand Action Plus intakes have the 273/318 sized ports and will work fine on your 273.
 
Rat Bastid said:
You can find them. I have a Holley Street Dominator out in the shop with a 273/318 port in it.

I didn’t even know they made the damned thing. I though they all had 340/360 port windows in them.
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Gee, I thought you were smarter than that. :poke::lol:
 
LO23M8B said:
What happened to my response? I was trying to help a member.
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You may be thinking of his last thread. Same opening post. Offering items for sale in a general thread is frowned upon here. If you have a part start a sale thread or respond to someone's wanted ad.
 
Camshaftkid said:
Hi all, I've been running into issues locating an aftermarket 4-barrel dual plane intake manifold for my 1969 Dart 273. Even Summit Racing is stumped by this request. I see no advertised 4-barrel intake manifold for this engine, only for the 318/340/360 ci small block engines. I understand there was a cylinder head change after 1966 for the 273, however there is no reference that I have found that indicates I can use the other small block manifold for my '69 LA273. They seem to all advertise for the larger displacements with no mention of the later 273 ci displacement. Please advise. Glenn
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Weiand Action plus, eddelbrock performer.
Both are small window intakes.
Fyi 318 and 273...same heads/specs.
 
Camshaftkid said:
Hi all, I've been running into issues locating an aftermarket 4-barrel dual plane intake manifold for my 1969 Dart 273. Even Summit Racing is stumped by this request. I see no advertised 4-barrel intake manifold for this engine, only for the 318/340/360 ci small block engines. I understand there was a cylinder head change after 1966 for the 273, however there is no reference that I have found that indicates I can use the other small block manifold for my '69 LA273. They seem to all advertise for the larger displacements with no mention of the later 273 ci displacement. Please advise. Glenn
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You need to start a wanted thread here for your intake like every other member does here. Posting a hard luck story and side stepping the sale rules here is not what you should be doing.
 
Old Edelbrock LD4B also came with 273/318 sized ports, if you happen to come across one by accident. I’ve read that some members swear by an unmodified street dominator for 273 use.
While on the subject of possible 273 intakes, an Edelbrock SP2P or an Offenhauser dual port that were introduced during the fuel crisis are not performance intakes by any stretch of the imagination, I think they would still be better performers than the stock two barrel on a low compression small cam 273. Not so much the SP2P, but the Offy dual port should make great power from idle to about 5000 rpm on a 273. It makes the most torque of any intake in a micro cam (.400 194 @ .050 108 LSA Isky Mil-a-more) RV 318 to 4,000 rpm.
The only manifold of that era I wouldn’t use is the Edelbrock 318 street master, unless I were trying to build a 30 mpg gallon highway engine. It might not even be good for that. It would have been okay if it weren’t designed with reverse tapered runners and almost every part of the plenum that doesn’t have an intake port coming out of it surrounded by exhaust crossover heat all the way to the carb pad.
But it’s a great intake for someone with a milling machine or shaper needing a base to cut and build a sheet metal intake on top of.
 
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str12-340 said:
The guy asked a legitimate technical question - what manifolds would fit his less popular motor. I think you are wrong on this one, Toolman (Not that I don't appreciate much of your policing).
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Legitimate question yes until someone steps in and offers one for sale. No need to argue about it. He got his question answered as to what fits his heads. Now he can start a wanted thread if he wants a used one like he is supposed to do. We have rules here to follow so this place can stay organized and on track. If you disagree you need to send me a pm.
 
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Do you know if the heads on your 273 are 64/65 or 66 and up??? The Edelbrock dual plane (ancestor of the LD340) is the D4B for 64/65 heads and, as mentioned before, the LD4B is for the 66 and up version. Both were originally designed for the 273 as the LA318 and 340 hadn't even come out then.
 
toolmanmike said:
You need to start a wanted thread here for your intake like every other member does here. Posting a hard luck story and side stepping the sale rules here is not what you should be doing.
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I don't know who you are, but I was not posting a hard luck story my friend. Please don't prove others right about Mopar guys being somewhat odd. Thank you. Glenn
 
Camshaftkid said:
I don't know who you are, but I was not posting a hard luck story my friend. Please don't prove others right about Mopar guys being somewhat odd. Thank you. Glenn
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Sorry Glen. I call em as I see them. You were commenting/complaining about not being able to find a manifold but I haven't seen you start a parts wanted thread yet. If you ask, sooner or later someone will notice and answer your ad.
 
is there a list somewhere of factory casting numbers? i have a few stock style intakes Id like to figure out what they were originally on. i do have a square bore cast piece that i was told was 68-69 340 but Id like to check the numbers..I do think the lD 4b was 273 318 specific and the LD 340 was wells elf explainatory. the bolt patter aside I agree any 318 intake owuld fit.
 
str12-340 said:
Do you know if the heads on your 273 are 64/65 or 66 and up??? The Edelbrock dual plane (ancestor of the LD340) is the D4B for 64/65 heads and, as mentioned before, the LD4B is for the 66 and up version. Both were originally designed for the 273 as the LA318 and 340 hadn't even come out then.
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Hi, this is a number's matching 1969 Dart code D 273. It isn't the early 273. Thanks for responding. Glenn
 
Dartswinger70 said:
is there a list somewhere of factory casting numbers? i have a few stock style intakes Id like to figure out what they were originally on. i do have a square bore cast piece that i was told was 68-69 340 but Id like to check the numbers..I do think the lD 4b was 273 318 specific and the LD 340 was wells elf explainatory. the bolt patter aside I agree any 318 intake owuld fit.
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I have those numbers in a Galen book. Post what you have and we can see what they are.
 
toolmanmike said:
I have those numbers in a Galen book. Post what you have and we can see what they are.
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I appreciate it. Ill have to get our in the garage this weekend and write them down. Thanks. I kknow I have the standard 340/360 TQ intake and that square bore supposed 340 piece. I also have the standard smog 2 barrel 318 piece as well as a few Edelbrocks. man the parts add up over the years...but I am mainly concerned with the two 4 barrel intakes the factory ones LOL!
 
toolmanmike said:
Sorry Glen. I call em as I see them. You were commenting/complaining about not being able to find a manifold but I haven't seen you start a parts wanted thread yet. If you ask, sooner or later someone will notice and answer your ad.
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You call them as YOU see them. Keep that in mind. Glenn
 
Camshaftkid said:
You call them as YOU see them. Keep that in mind. Glenn
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Let me explain, we have had a rash of parts sales in technical forums. Along with those comes scammers and sales gone bad. When I see someone mentioning they are looking for a particular part and someone jumps in with to offer one I stop the process immediately if I see it. I happen to be reading the thread because it is about 273's and I have one in my 66 Dart. I am just trying to keep the forums running smooth with no issues.
 
Camshaftkid said:
Hi, this is a number's matching 1969 Dart code D 273. It isn't the early 273. Thanks for responding. Glenn
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WOW! I had no idea that they even offered a 273 in 1969. I was assuming that this was a motor that someone put in the car at a later time.
 
I had a 68 Sattellite 2 door on the lift years ago. This was back in 07 I think. the car was original and the guy was like "Its a 318 I think" I looked at the numbers on the block it was a 273. He was surprised by that. The owner didn't know he had a 273 in that B body. It was a nice original condition car.
 
str12-340 said:
WOW! I had no idea that they even offered a 273 in 1969. I was assuming that this was a motor that someone put in the car at a later time.
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2 barrel with hydraulic cam in 68 and 69. The solid cam 4 barrel ended in 67.
 
toolmanmike said:
Let me explain, we have had a rash of parts sales in technical forums. Along with those comes scammers and sales gone bad. When I see someone mentioning they are looking for a particular part and someone jumps in with to offer one I stop the process immediately if I see it. I happen to be reading the thread because it is about 273's and I have one in my 66 Dart. I am just trying to keep the forums running smooth with no issues.
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Unfortunately, I think some are reading into my post, beyond what I'm posting. My question isn't a simple one, I know, because I've done my research. My '69 273 is running OK, however I thought to increase its ability, for now. At some point I may install another engine, but when I don't have to, then I see no reason to. I didn't realize the 273 was so disposable that there are limits to aftermarket performance parts for this engine. Mopar kept changing things in the 60's making it hard to keep up with the changes. I understand emissions were introduced as a concern back then that changed everything. I'm on hold right now with Edelbrock, just got off the phone with Weiand, no help there. I'll take it from here, I just thought someone may have run into this issue before me and that I might be able to learn from their research. Thanks for all the assistance. Glenn
 
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