Hood scoop cracking prevention ?

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Kent mosby

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I have panel bonded (jb weld panel bond) and bolted (16 bolts) my six pack hood scoop on my 73 scamp. I have read many many threads on cracking. Many say that it is inevitable. Yet I cannot find a single picture of the cracks. Where exactly does it crack? At the junction of metal to glass, in the middle of the blend? Or everywhere along the blend? I am asking because I am contemplating squaring off the metal to fiberglass junction so that any crack would be at the junction and “invisible” in the seam. I will be sanding the area square today and prime it to see how it looks. My thoughts are that it will be something different. A six pack scoop mounted more similar to a hemi scoop than blended like a six pack. Any thoughts, pics and advice?? I will start sanding in a few hours.
 
I am going to do a bit of a combo. The hood on the scamp has a raised area that meets up with the scoop. It will be a tricky blending. I just applied panel bond at the edge to fill any gaps. I had to go to work and get some epoxy tips that I use in dentistry that are small and lays down a 1/8 inch or less bead of material. Work in progress. Waiting for the panel bond to cure.
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My sixpack scoop cracked everywhere i put a screw, both toward the edge and the main body of the scoop. I removed it, filled the holes, mounted a factory part# raisin bran scoop, after modifying the center to clear the ridge in the center of my hood.
I dont even know where the scoop came from, it was in my garage, and looked a little like a maxwedge scoop, so i used it. If i knew then what they would eventually be worth..... i would have used something else.
 
My sixpack scoop cracked everywhere i put a screw, both toward the edge and the main body of the scoop. I removed it, filled the holes, mounted a factory part# raisin bran scoop, after modifying the center to clear the ridge in the center of my hood.
I dont even know where the scoop came from, it was in my garage, and looked a little like a maxwedge scoop, so i used it. If i knew then what they would eventually be worth..... i would have used something else.
Did you panel bond your scoop? If so I am in trouble. I hope that it will be secure. How many nuts and bolts did you use as well?
 
I think i used about 20 stainless screws. There was no such thing as panel bond when i did mine. ALL i used was the screws, i didnt try to bond or blend the scoop on, it was obvious it wasnt stock, and i heard that a bondo or fiberglass blend would crack anyway.
I think your technique has far more chance of longterm success than mine. I think if i were doing mine again, i would get the kind of sixpack scoop with the bolt on provision, rather than the flange type.
With the flange type, i would probably open the hole in the hood up to the size of the scoop, and use some fiberglass mat on the inside, wrapped and bonded to the bottom side of the hood.
 
I took a different approach with my six-pack hood scoop. Using the sheet metal that I cut out of the hood in the shape of an X with a fabricated bracket to bolt the center of the scoop to the sub frame of the hood in order to help stabilize scoop from flexing in the wind. It was mounted with rivets (rivets were removed after the the scoop was fully bonded) and fiberglass putty and fiberglas matte over the top outside edges. It's been 5 years now and it's still holding up.

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