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Re: need more power from 273
[Re: JBurch]
#1396370
03/03/13 10:04 AM
03/03/13 10:04 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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I played with these engines year ago. Not much gain for the buck at all.
A 360 low compression with a 4 barrel will be the cheapest.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: need more power from 273
[Re: 383man]
#1396372
03/03/13 11:36 AM
03/03/13 11:36 AM
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Joined: Feb 2009
Posts: 207
People's Republic of Mass.
Belvedere2
enthusiast
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enthusiast
Joined: Feb 2009
Posts: 207
People's Republic of Mass.
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Quote:
I bought this 273 four barrel 235 hp 66 Dart in 1974. I rebuilt the 273 and added a bigger solid cam. I think it had the original AFB on it that I used and I think I used an Eddy 318 dual plane intake. I added JR fenderwell headers. It was a four speed and I put a drum to drum rear in it from a 68 Dart 340 car. Had 3.91's and ran high 14's. But when I wanted to get serious I was going to notch the cyl and add 340 heads. I ended up dropping a 340 in it with 4.56's and it ran a best of 11.90's until I rolled it in 1982. It just seemed everytime I really wanted to step up some I kept going to 340 or 360 parts so thats why I just put a 340 in it. I would say the headers and 318 Eddy intake helped my 10.5 to 1 comp 235hp 273 some for a few simple bolt ons. It just seemed everytime I wanted to try and make some real hp I kept hearing about adding 340 parts so thats why I finally put one in it. You have to do some serious head work to really start getting some power out of the 273. Good luck which ever way you go. Ron
That was one nice car!
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Re: need more power from 273
[Re: kbeeper69]
#1396373
03/03/13 11:38 AM
03/03/13 11:38 AM
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Joined: Jan 2003
Posts: 10,000
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,000
Frostbitefalls MN (Rocky&Bullw...
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If you look at the class records for the 273 stockers, compared to a 318, 360 or 340 that will give you an idea of what a difference there will be between the sizes of motors. Cubic inches x airflow x good combo x rpm = horsepower. Your 273 is hampered with a 3.31 stroke and small bore, and in need of a solid cam and better valve train,rods and pistons to build a lot of hp. It can however respond to basic stuff like headers, manifold, cam etc. Just remember you still only have 273 cubes.
There is some fun in taking the road less traveled, so you might find it a lot of fun to develop a package that will run hard with a small motor. That of course would be easier with a four speed than an auto trans.
Last edited by gregsdart; 03/03/13 11:44 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: need more power from 273
[Re: WO23Coronet]
#1396377
03/03/13 07:32 PM
03/03/13 07:32 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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What year is the 273? Everyone I ever had was solid lift from the factory. You cannot bolt a 318-360 intake on it unless it is 66 or newer engine.
The engines can get good fuel mileage though.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: need more power from 273
[Re: Leon441]
#1396378
03/03/13 11:24 PM
03/03/13 11:24 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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68-69 all had hydraulic cams
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: need more power from 273
[Re: Belvedere2]
#1396379
03/04/13 01:12 AM
03/04/13 01:12 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
I bought this 273 four barrel 235 hp 66 Dart in 1974. I rebuilt the 273 and added a bigger solid cam. I think it had the original AFB on it that I used and I think I used an Eddy 318 dual plane intake. I added JR fenderwell headers. It was a four speed and I put a drum to drum rear in it from a 68 Dart 340 car. Had 3.91's and ran high 14's. But when I wanted to get serious I was going to notch the cyl and add 340 heads. I ended up dropping a 340 in it with 4.56's and it ran a best of 11.90's until I rolled it in 1982. It just seemed everytime I really wanted to step up some I kept going to 340 or 360 parts so thats why I just put a 340 in it. I would say the headers and 318 Eddy intake helped my 10.5 to 1 comp 235hp 273 some for a few simple bolt ons. It just seemed everytime I wanted to try and make some real hp I kept hearing about adding 340 parts so thats why I finally put one in it. You have to do some serious head work to really start getting some power out of the 273. Good luck which ever way you go. Ron
That was one nice car!
Thank you.  Ron
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Re: need more power from 273
[Re: SLOW67]
#1396381
03/04/13 02:23 PM
03/04/13 02:23 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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If it were in an A-body, I'd say do the standard hot-rod stuff (intake, carb, headers, etc.). But in a car that likely is pushing 3800 lbs, 273 cubes comes with a reality thats going to be a losing battle. Personally, I'd spend any money slowly on getting a 360 together. 
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: need more power from 273
[Re: StealthWedge67]
#1396382
03/05/13 04:22 PM
03/05/13 04:22 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
If it were in an A-body, I'd say do the standard hot-rod stuff (intake, carb, headers, etc.). But in a car that likely is pushing 3800 lbs, 273 cubes comes with a reality thats going to be a losing battle. Personally, I'd spend any money slowly on getting a 360 together.
 I'd be watching craigslist for a running magnum 360, swap the t-chain cover, get a car oil pan, an eddie magnum air gap, and a 600-650cfmish carb
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: need more power from 273
[Re: kbeeper69]
#1396383
03/06/13 09:17 AM
03/06/13 09:17 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
66 thousand mile original motor .only 2 barrel. Just looking for a few options.my first small block car.
It can still be a good little driver that sounds cool... to some thats all you need in a car. A 273 in a B-body will never be fast... not without a ridiculous effort and outlay anyways. Keep in mind the 273 is almost 100cid smaller than the 360.
Quick fun? Headers, 2.5" dual exhaust, pick your favorite sounding mufflers. Aluminum dual-plane 4bbl intake, carb, open-element air cleaner. Electronic ignition maybe? for a bit better driver, though it wont make you any faster. Tune it very well, recurve the distributor, etc. Pull the AC compressor off if it has one. Lose any weight in the car you dont need.
Spending a bit more money? Find a Magnum 5.2 or 5.9L top-end... heads, all that goes with, and buy an RPM intake. This will be an improvement that you can actually feel, and make it more efficient too. Gears for the rear... what you have is probably a bit long. A cam will help wake that lil' thing up too, especially with the heads if you go that route.
Even more money? swap in a 340 or 360, or better yet, a 360 Magnum or big block. This really is the first real step up to any real speed and doesn't have to cost all that much.
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Re: need more power from 273
[Re: Pale_Roader]
#1396384
03/06/13 11:11 AM
03/06/13 11:11 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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magnum valves are too big for a stock 273 without notching the bore....
I'd probably limit it to a dual exhaust system, intake and 4bbl, parts that can be easily swapped to a larger engine. anything more than that, you're better off starting off with a 318 or 360...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Just like the chevy 265/283/302/327 all outdated and exspensive if you do want to rebuild.
