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Re: 273 building and info needed PLEASE!
[Re: MuuMuu101]
#1661706
08/23/14 06:52 PM
08/23/14 06:52 PM
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Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
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Quote:
This is all interesting as I've got a 273 in my Dart that's tired and a standard bore '68 block in my garage. 
I am following your build. I would stay with the 273 if it were my car. I think I have some standard bore pistons laying around. I also have some .060 forged pistons as well.
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Re: 273 building and info needed PLEASE!
[Re: dart4forte]
#1661707
08/23/14 10:49 PM
08/23/14 10:49 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Light rods (floaters) & new eBay bushings
live every 24 hour block of time like it's your last day on earth
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Re: 273 building and info needed PLEASE!
[Re: ronhug]
#1661709
08/23/14 11:27 PM
08/23/14 11:27 PM
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Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
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Quote:
so here's what its looking like, 273, with later model light rods, swirl port heads milled 0.05 and ported to a stock 360 four barrel intake, maybe 2.02 and 1.78 valves. stock 318 roller lifters. and a cam with a 340 HP profile.
its a "guy" thing why build a 273 ? cause we can !!! I'm rebuilding my first car, it was a 64 barracuda four speed 273, my brother and I drove variants and Barracuda through our youth, we bucked the GM tied.
my beater stock 273 lost most street races but I did win a few out of maybe nothing more then bigger balls. so out of love and respect for my first car the 273 has to stay, So to all of you that have commented please continue to do so your help is greatly appreciated and needed. (oh and as a reminder this is a "low-buck" project)
I assume you will have the machine work done by a local shop. You may want take some measurements such as deck height, how far the pistons are in the hole etc. before taking anything off both the heads and the deck.
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Re: 273 building and info needed PLEASE!
[Re: dart4forte]
#1661710
08/24/14 12:06 AM
08/24/14 12:06 AM
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Joined: Dec 2003
Posts: 22,783
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,783
Bitopia
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2.02 valves in a 273, why? And how much notch/shrouding are you willing to accept?
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: 273 building and info needed PLEASE!
[Re: dart4forte]
#1661715
08/24/14 03:48 AM
08/24/14 03:48 AM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Quote:
Quote:
This is all interesting as I've got a 273 in my Dart that's tired and a standard bore '68 block in my garage.
I am following your build. I would stay with the 273 if it were my car. I think I have some standard bore pistons laying around. I also have some .060 forged pistons as well.
I'm really uncertain. I kind of want to save the 273 for another project. I was thinking something along the lines of an Early-A. Something like a cruiser Dart or Valiant wagon or a Trans Am "like" car for a 63-65 Dart or Barracuda.
They made .060" over pistons for the 273? Can the block handle that kind of bore? That definitely sounds interesting. You think you can make a 91 octane engine with those?
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Re: 273 building and info needed PLEASE!
[Re: dart4forte]
#1661717
08/24/14 04:37 AM
08/24/14 04:37 AM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Quote:
I have the specs on the pistons vs different head gasket and head CC combinations. My last 273 was .060 over. No problems.
The pistons are the old school Badgers. The tops have been machined to get the cr down plus they are a little lighter
.060 over, some head work, and a good intake with a 4-barrel carb should wake up a 273 quite a bit and make it run pretty nicely.
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Re: 273 building and info needed PLEASE!
[Re: MuuMuu101]
#1661718
08/24/14 04:40 AM
08/24/14 04:40 AM
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Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
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Quote:
Quote:
I have the specs on the pistons vs different head gasket and head CC combinations. My last 273 was .060 over. No problems.
The pistons are the old school Badgers. The tops have been machined to get the cr down plus they are a little lighter
.060 over, some head work, and a good intake with a 4-barrel carb should wake up a 273 quite a bit and make it run pretty nicely.
That and depending the trans with some 3.55s to 3.91s it will be a little screamer.
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Re: 273 building and info needed PLEASE!
[Re: ronhug]
#1661719
08/24/14 12:47 PM
08/24/14 12:47 PM
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Joined: Dec 2003
Posts: 22,783
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,783
Bitopia
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"so here's what its looking like, 273, with later model light rods, swirl port heads milled 0.05 and ported to a stock 360 four barrel intake, maybe 2.02 and 1.78 valves." Quote:
im surprised im plowing new ground here? i really thought someone had been down this road and would share their knowledge, the valve size was intended to be more a question, but yes talking out loud here may need more clearance cut then could be sustained,
273 Std bore is 3.625, combined valve dim is 3.8, that would be fairly new ground.
Rather then just bore the 273 .060, I'd go .285 over. 
I have in one of my cars a warmed over 273, I am very surprised at how peppy it is for a 273, but if great mileage is any concern, mine would not make you happy, and I would never build one.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: 273 building and info needed PLEASE!
[Re: jcc]
#1661720
08/24/14 06:58 PM
08/24/14 06:58 PM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Quote:
"so here's what its looking like, 273, with later model light rods, swirl port heads milled 0.05 and ported to a stock 360 four barrel intake, maybe 2.02 and 1.78 valves."
Quote:
im surprised im plowing new ground here? i really thought someone had been down this road and would share their knowledge, the valve size was intended to be more a question, but yes talking out loud here may need more clearance cut then could be sustained,
273 Std bore is 3.625, combined valve dim is 3.8, that would be fairly new ground.
Rather then just bore the 273 .060, I'd go .285 over.
I have in one of my cars a warmed over 273, I am very surprised at how peppy it is for a 273, but if great mileage is any concern, mine would not make you happy, and I would never build one.
Lol... 273 bored .285 over... 
I'm curious what the Trans AM guys racing the 273's in Early A's did to their engines. Probably a lot of custom work.
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Re: 273 building and info needed PLEASE!
[Re: MuuMuu101]
#1661721
08/24/14 09:00 PM
08/24/14 09:00 PM
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Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,167
Mesa, Arizona
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Quote:
Quote:
"so here's what its looking like, 273, with later model light rods, swirl port heads milled 0.05 and ported to a stock 360 four barrel intake, maybe 2.02 and 1.78 valves."
Quote:
im surprised im plowing new ground here? i really thought someone had been down this road and would share their knowledge, the valve size was intended to be more a question, but yes talking out loud here may need more clearance cut then could be sustained,
273 Std bore is 3.625, combined valve dim is 3.8, that would be fairly new ground.
Rather then just bore the 273 .060, I'd go .285 over.
I have in one of my cars a warmed over 273, I am very surprised at how peppy it is for a 273, but if great mileage is any concern, mine would not make you happy, and I would never build one.
Lol... 273 bored .285 over...
I'm curious what the Trans AM guys racing the 273's in Early A's did to their engines. Probably a lot of custom work.
You can expect a stock/super stock 273 to come in around 30k. A lot of money for a 273. Of course everything is flow enhanced. I've only seen one transam 273 but that was in a nostalgia car.
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Re: 273 building and info needed PLEASE!
[Re: dart4forte]
#1661723
08/24/14 10:52 PM
08/24/14 10:52 PM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Quote:
You can expect a stock/super stock 273 to come in around 30k. A lot of money for a 273. Of course everything is flow enhanced. I've only seen one transam 273 but that was in a nostalgia car.
I don't think I've got $30k for a 273... Let me check my pockets... Nope... Machining and labor included how costly would it be to build a 300+ horsepower 273? I mean,if I'm not mistaken, the D-Dart pulled 275 hp apparently with a larger cam, headers, and a 4-barrel.
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