zhandfull
Well-Known Member
Subscribed! Great thread 
67' Barracuda 273 (Camshaft Results at the Track)
- Thread starter 69 Cuda 440
- Start date
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Mile an hour,getting up there.Never seen a Norris cam,in action. 106 through the high end,really good for the heads in stockish condition.
Camshaft #6........Next up
'Crower 300' (1971 Model)
.477 / . 477 Lift ~ 280* / 280 * Duration ~ 112* LSA
We will perform an Accelerated Test on Saturday.
We used this Camshaft back in 1971, in one of our 67' 273/235 HP Commando Barracuda
Drag Race cars, and with excellent results.
'Crower 300' (1971 Model)
.477 / . 477 Lift ~ 280* / 280 * Duration ~ 112* LSA
We will perform an Accelerated Test on Saturday.
We used this Camshaft back in 1971, in one of our 67' 273/235 HP Commando Barracuda
Drag Race cars, and with excellent results.
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The old Crower cams,were nice product.Found a old 264f solid ,I threw in a 318 build.264 adv,226@ .050,on a 110 lobe center. Idled like stock,pullled to 6k+,still pulling. Nice addition,on your part.
Are any of these cams currently available? Or are they all out of your NOS stash?
When I rebuilt my Commando 273 back in the 80s, there weren't a lot of choices available. My shop talked me into a hydraulic cam as the closest grind they could find to stock.
Crower #31914
264 advertised duration
Intake lift .427
Exhaust lift .427
Lobe center 110
208 Duration at .050
I'm still running it. But next build I want to go back to a solid stick.
When I rebuilt my Commando 273 back in the 80s, there weren't a lot of choices available. My shop talked me into a hydraulic cam as the closest grind they could find to stock.
Crower #31914
264 advertised duration
Intake lift .427
Exhaust lift .427
Lobe center 110
208 Duration at .050
I'm still running it. But next build I want to go back to a solid stick.
MVH,
We're not sure what we are going to do with these older profile Camshafts. All are in
excellent 'used' condition, and have not been abused.
The 273 'Loves the Crower' 'solid bumpstick', that we can atest to.
You must go back to a 'Solid Lifter' unit....if you want to be 'Commando'.
Though I do have to say, the 'Norris 273 Race' (1969 Profile)
idled so smooth, despite being listed as having a 'Lopey Idle'.
* .466" Lift
* 270* Duration
* 224* @ .050"
* 110* LSA
* 106* CL
That Camshaft would even work well with an Automatic Transmission, Stock Converter, and 3.55 Gears - as long as you have a good exhaust system.
We're not sure what we are going to do with these older profile Camshafts. All are in
excellent 'used' condition, and have not been abused.
The 273 'Loves the Crower' 'solid bumpstick', that we can atest to.
You must go back to a 'Solid Lifter' unit....if you want to be 'Commando'.
Though I do have to say, the 'Norris 273 Race' (1969 Profile)
idled so smooth, despite being listed as having a 'Lopey Idle'.
* .466" Lift
* 270* Duration
* 224* @ .050"
* 110* LSA
* 106* CL
That Camshaft would even work well with an Automatic Transmission, Stock Converter, and 3.55 Gears - as long as you have a good exhaust system.
What I have hear about "Norris" ,mellow cams.The guy,I learned from stuffed possibly,the sam cam in 71/72 .Went slower ,than the cam he had then.(Big hydraulic,don't know the specs) 4.88 's/4 spd,slicks out back.
Johnny Mopar,,,,,,,,
The 273 block was decked to NHRA Specifications.
The top of the Piston Dome is {+.0129} above the block deck.
The JE Lightweight Pistons, had the valve pockets fly-cut by our Bridgeport Milling
Machine, to provide for clearance up to a .530 Lift Camshaft.
The block deck surface was 'O-Ringed' (B-H-J 'O-Ring' Cutter).
We are using 'old and original' Chrysler Performance thin metal head gaskets (.020" Thickness)
that have been sprayed with 'copper-coat'. We had '5-sets' of them sitting in a cardboard
box for 40+ years.
No leaks, and no blow-outs between the cylinders.
Next Camshaft to go in,,,,,,,Racer Brown ST-12 (.480 Lift / 292* Duration)
The 273 block was decked to NHRA Specifications.
The top of the Piston Dome is {+.0129} above the block deck.
The JE Lightweight Pistons, had the valve pockets fly-cut by our Bridgeport Milling
Machine, to provide for clearance up to a .530 Lift Camshaft.
The block deck surface was 'O-Ringed' (B-H-J 'O-Ring' Cutter).
We are using 'old and original' Chrysler Performance thin metal head gaskets (.020" Thickness)
that have been sprayed with 'copper-coat'. We had '5-sets' of them sitting in a cardboard
box for 40+ years.
No leaks, and no blow-outs between the cylinders.
Next Camshaft to go in,,,,,,,Racer Brown ST-12 (.480 Lift / 292* Duration)
lilredridinghoo
Well-Known Member
great effort - nice to see, how a set-up will be related to the cam
thanks
thanks
Johnny Mopar,
The Combustion Specifications.
* Cylinder Head Chamber............................57.3 CC
* .020" Thickness Cyclinder Head Gasket........ 3.0 CC
The JE {10.5-1} has a Dome Height of .140".
When the Piston is installed, it is (above deck) at .129"
The Dome Volume equals (16.1 CC)
57.3 + 3.0 = 60.3 (Chamber Volume)
60.3 - 16.1 = 44.2 (Net Chamber Volume, approx.)
The Combustion Specifications.
* Cylinder Head Chamber............................57.3 CC
* .020" Thickness Cyclinder Head Gasket........ 3.0 CC
The JE {10.5-1} has a Dome Height of .140".
When the Piston is installed, it is (above deck) at .129"
The Dome Volume equals (16.1 CC)
57.3 + 3.0 = 60.3 (Chamber Volume)
60.3 - 16.1 = 44.2 (Net Chamber Volume, approx.)
Thanks for the reply. But actually, what I meant was, would any of these cams be available new from the manufacturer? Or all they all out of production designs?
MVH,,,,,,
These Camshafts are all older profiles,,,,,,(1968 thru 1973).
We have a 'brand new' and 'never installed' Crane Compu-Cam from 1973
.570 Lift
We were going to install it in our Race Car - SS/I 68' 340 Barracuda for the
end of the 1973 Racing Season, but we were beating everybody so we never installed it.
That may be the only one with a current profile, besides the Racer Brown ST-12.
These Camshafts are all older profiles,,,,,,(1968 thru 1973).
We have a 'brand new' and 'never installed' Crane Compu-Cam from 1973
.570 Lift
We were going to install it in our Race Car - SS/I 68' 340 Barracuda for the
end of the 1973 Racing Season, but we were beating everybody so we never installed it.
That may be the only one with a current profile, besides the Racer Brown ST-12.
chuck perry
Active Member
One thing I got to say is thank you . Taking the time and doing all of this.
This has made me think where I am going with my 273 .
This has made me think where I am going with my 273 .
Thanks,,,,,,,,,Chuck P.
Just proof, that you can make a 'little' 273 Commando run in the 12.00's with
some ingenuity, and utilizing 'old' shelf performance parts without going broke.
Nothing personal to the '318 Racers', but I will never put one together for
Racing.
Back in the day, we used them for 'the family car' or Tow Car....
Just proof, that you can make a 'little' 273 Commando run in the 12.00's with
some ingenuity, and utilizing 'old' shelf performance parts without going broke.
Nothing personal to the '318 Racers', but I will never put one together for
Racing.
Back in the day, we used them for 'the family car' or Tow Car....
Djakken
Well-Known Member
This thread is one of the best on FABO and your last post is exactly how I see 273:s vs. 318:s. I will take your statement with me when I talk to those who throw out their 273 in favor of a 318.
Thanks 69 Cuda 440
Thanks to all who added their thoughts,,,,,,,,,,much appreciated.
The Racer Brown #ST-12 camshaft is going in tomorrow,,,,,,
Lift....................480" Intake / .480" Exhaust
Duration.............294* / 294*
Duration.............250* @ .050" Lift
Overlap..............76 *
Lobe Seperation..108*
Lash................ .017" / .030"
And we are going with the #250 Load-Rated Valve Springs.
I know we're pushing it, but we wanted to see how these Crower Valve Springs
hold up over 6000 RPM's.
The Crower #68305X1 (Single Spring w/Damper)
* Installed Height........1.650" @ 95 lbs.
* Height....................1.200" @ 250 lbs.
* Height....................1.150" @ 268 lbs.
* Coil Bind..................1.050"
The Racer Brown #ST-12 camshaft is going in tomorrow,,,,,,
Lift....................480" Intake / .480" Exhaust
Duration.............294* / 294*
Duration.............250* @ .050" Lift
Overlap..............76 *
Lobe Seperation..108*
Lash................ .017" / .030"
And we are going with the #250 Load-Rated Valve Springs.
I know we're pushing it, but we wanted to see how these Crower Valve Springs
hold up over 6000 RPM's.
The Crower #68305X1 (Single Spring w/Damper)
* Installed Height........1.650" @ 95 lbs.
* Height....................1.200" @ 250 lbs.
* Height....................1.150" @ 268 lbs.
* Coil Bind..................1.050"
1970 La
Well-Known Member
The one I have been waiting for! Thanks for all the efforts.
Subscribed.
chuck perry
Active Member
Check out your local cam regrinder and see if they have the specs for these "oldschool"
Cams. Not saying give away anything. But I know the man at Camcraft wants
A oldschool D/Dart cam for his catalog
rayer:. I am trying to build a "tribute" engine for 68 dart and was thinking about the MP .484 .528 ,but after reading this thread I'm really liking these old vintage profiles.
stroker402
1968 dart GTS convertible
Video of my 273 dartcharger reving
[ame="http://s446.photobucket.com/user/stroker402/media/3d2cdd52.mp4.html"]Nice Rev Seafoam Tips No Smoke Video by stroker402 | Photobucket@@AMEPARAM@@http://i446.photobucket.com/albums/qq185/stroker402/bth_3d2cdd52.mp4@@AMEPARAM@@446.photobucket.com/albums/qq185/stroker402/bth_3d2cdd52.mp4[/ame]
from after reading this article regarding these old school cams .. I'm thinking that maybe my cam may have been switched over the years.. I do know that a preivious owner did race my dartcharger way back then ... another reason being ........ this engine loves to rev over 7 grand with ease ,, but will like a kitten. one more reason is , it will have NOOOOOOO problem hangin with my buddies duster and dart 340/360 with a mild cam, headers ,750 carb and 3:91 gears.
here s alittle video of my 273 reving 5k and not even touch the secondaries .. that's nothing .. it tachs up sooo fast ..
I have a pertonics ign with a rev limiter set at 6500 and a tack hooked up too,, to confirm the rpms .. soooooooo.. It's not a joke ..... engine is a freak ! it revs !!
i'm thinkin it may have one of those cams you tested.
imo.
[ame="http://s446.photobucket.com/user/stroker402/media/3d2cdd52.mp4.html"]Nice Rev Seafoam Tips No Smoke Video by stroker402 | Photobucket@@AMEPARAM@@http://i446.photobucket.com/albums/qq185/stroker402/bth_3d2cdd52.mp4@@AMEPARAM@@446.photobucket.com/albums/qq185/stroker402/bth_3d2cdd52.mp4[/ame]
from after reading this article regarding these old school cams .. I'm thinking that maybe my cam may have been switched over the years.. I do know that a preivious owner did race my dartcharger way back then ... another reason being ........ this engine loves to rev over 7 grand with ease ,, but will like a kitten. one more reason is , it will have NOOOOOOO problem hangin with my buddies duster and dart 340/360 with a mild cam, headers ,750 carb and 3:91 gears.
here s alittle video of my 273 reving 5k and not even touch the secondaries .. that's nothing .. it tachs up sooo fast ..
I have a pertonics ign with a rev limiter set at 6500 and a tack hooked up too,, to confirm the rpms .. soooooooo.. It's not a joke ..... engine is a freak ! it revs !!
i'm thinkin it may have one of those cams you tested.
imo.
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