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1971 Plymouth GTX vs. Blown Mustang

Old 11-13-2010, 03:18 PM
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Mustang_NTriangle
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Default 1971 Plymouth GTX vs. Blown Mustang

Today was a great day!! i ran into my brothers old 1971 Plymouth GTX 440 with hurst 4 speed he had it back in mid 80's and i remember that car being crazy fast (80 mph out of 2nd gear). It has some work done to it some bolts and cams and pushing 450-500 HP at the fly wheel but a very heavy car.

We got to a traffic light side by side asked the guy if he wanted to run. He did. Light went green, and we both had slight traction issues. I got him quickly by 1-2 lengths in 1st gear while both of us spinning. Once I got it in 2nd gear, I took 4-6 lengths on him before shutting down.

He gave me thumbs up! I have been waiting several years to run this car and wanted to run him on the highway but he wouldn't.

Needless to say, i sent a text message to my brother telling him i just spanked his old car but have not heard from him yet.
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Old 11-13-2010, 11:31 PM
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94Blk5.0
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'71 GTX's are phucking gorgeous.

Nice run.
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Old 11-14-2010, 07:39 AM
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that's awesome man
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Old 11-14-2010, 09:08 AM
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Good kill.
Just curious. How do you know the GTX engine was producing 450-500 hp at the crank?
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Old 11-14-2010, 10:46 AM
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Originally Posted by ski
Good kill.
Just curious. How do you know the GTX engine was producing 450-500 hp at the crank?
It was my brothers car and stock from factory they were underatted at 375 hp. With headers, cams, and a bigger carb it would be in that range. I believe he trapped 120 mph with that car at the track not sure of the times it was 25 years ago.
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Old 11-14-2010, 10:49 PM
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is that the 71' rating of HP?
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Old 11-15-2010, 05:24 AM
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nice run, but not a surprise based on power levels
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Old 11-15-2010, 07:49 PM
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Originally Posted by Stkjock
nice run, but not a surprise based on power levels
thx. I figured i would definitely win but wanted the chance and got it. I was 11 years old in '85 and thought car was awesome. My poor stupid brother ended up selling that perfect running car just needed some paint for something like 7 grand in early 90's once he got married.

Car is today is worth close to 100k at all numbers matching.
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Old 11-16-2010, 09:09 AM
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Originally Posted by Mustang_NTriangle
It was my brothers car and stock from factory they were underatted at 375 hp. With headers, cams, and a bigger carb it would be in that range. I believe he trapped 120 mph with that car at the track not sure of the times it was 25 years ago.
I thought it may have been chassis dyno tested, and the chp was then reverse calculated from the rwhp, instead of merely a chp estimate.
However, a 120 mph trap speed denotes a very powerful powerplant. It would be interesting to see what it traps now.

Last edited by ski; 11-16-2010 at 09:12 AM.
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Old 11-16-2010, 09:11 AM
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Originally Posted by simpsonfan13
is that the 71' rating of HP?
The 1971 GTX was rated at 370 hp.
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