Trunk lid will not stay open

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1971 Mustang Mach 1, M code, 4 speed.
Interestingly enough now that I redid my trunk lid and the spoiler was moved to the correct location, it stays open on its own. I didn't think about it at that time, but before the spoiler was in the wrong location a couple of inches further back, which placed more force on the rods. Now it stays open as it should. That said, the location of the spoiler is something else to think about.
interesting Tony. Good point.
On my car it had a repop spoiler added to the dimensions shown in NPD's instructions. These dimensions are 1" further back than the dimensions shown on the 429 mega site. My trunk does stay open, just. Any further back and I certainly can see it not staying open at all.
 

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1971 M-Code Mach 1 w/408C stroker
interesting Tony. Good point.
On my car it had a repop spoiler added to the dimensions shown in NPD's instructions. These dimensions are 1" further back than the dimensions shown on the 429 mega site. My trunk does stay open, just. Any further back and I certainly can see it not staying open at all.
Those are the dimensions that the shop followed.
 

JJHStang

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1971 Ford Mustang Mach 1
[url=https://ibb.co/b33Pn4f][img]https://i.ibb.co/6ZZm5Kd/20190723-095138-1.jpg[/img][/url]

[url=https://freeonlinedice.com/]black and red dice[/url]
I have viewed many pics and also measured the location from front of trunk (rear window) and the first screw is 9.5”.
Based on a picture I received of correct measurements my spoiler is positioned correctly.
I have made a prop stick. Last car show was at the wind was blowing in back to front so no issues with trunk lid shutting. Didn’t need the prop rod.:)
 

JJHStang

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Texas
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1971 Ford Mustang Mach 1
[url=https://ibb.co/b33Pn4f][img]https://i.ibb.co/6ZZm5Kd/20190723-095138-1.jpg[/img][/url]

[url=https://freeonlinedice.com/]black and red dice[/url]
I have viewed many pics and also measured the location from front of trunk (rear window) and the first screw is 9.5”.
Based on a picture I received of correct measurements my spoiler is positioned correctly.
I have made a prop stick. Last car show was at the wind was blowing in back to front so no issues with trunk lid shutting. Didn’t need the prop rod.:)
Thank you Stanglover for the measurements.
 
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