Im installing a FG cowl scoop (4") on a flat chevelle stock hood. When I lay the scoop on the hood, it touches at the front and back, and the sides are about 1/2" or a little less from touching the hood. I'm planning on attaching it with body panel adhesive cause I dont want any rivets in there. If I push down on the scoop flange, it will touch the hood without too much trouble, and Im wondering if I glue it then use a couple self drilling screws on each side to hold it till the glue dries, will that be OK? Im wondering if the pressure from the slight arch shape will pull up hard enough to loosen the bond?? Im sure the glue must hold really well, but it sure would be embarrassing if the whole scoop just sorta popped off while Im sitting at a show or cruize-in :eek: ...A friend suggested a couple screws counter sunk below the surface on the flange, then filled. I have to Mar-Glass the whole flange area anyway. Any ideas?? Thanks John

In my opinion, the screws would cause you more grief in the long run. They would be the possible weak link in the process.
I would attach it with 3M body 'glue' and use some weight to attain the right mounting position.
remember to glue it to bare metal and not a painted surface.

The problem I have is I think you really need to "clamp" it somehow. If you use screws, just remove them and fill the holes before finishing it. You will have to be careful that the scoop doesn't do PULL the hood UP instead of bending down to fit the hood, that would be a disaster. On that note, putting weight on the scoop will likely PUSH the hood DOWN instead of just the scoop! You will have to take great care in keeping the hood shape right while bonding that scoop on.

By the way, have you tried heating that scoop up to bend it back in shape? If you have a nice sunny day, that may be enough. Put it out on something black so it will absorb the heat and warm that bugger up. Then, put something on top of it while it is laying on a table or something to flatten it out. Leave it to cool and it should take that shape. THEN bond it on your hood.

Jimmie, I agree, I dont really want to leave the screws in, I think they would be trouble later on. And yes, it will be bare metal where the glue goes. Brian, I didnt realize that fiberglass will bend a little with the heat, I thought once it was cured, it would stay that way...I'll give it a try, dont forget though with 4" high sides, that gives it quite a bit of strength against bending it down...but I'll try out in the sun with a couple patio stones on top. It doesnt have to go too much, so maybe. Thanks guys. John

I would use Vette panel adhesive made by evercoat.Its designed o bond corvette panels together.Use screws to hold it,the when its cured remove them and fill the holes with the adhesive.

What type of paint system is on your hood? I wouldn't scrape it off to get to bare steel if you already have a perfectly good base with the paint, unless of course there is no paint to begin with.............. :D

I'm getting samples sent to the lab from the gentleman who developed the aftermarket adhesive that was used to bond the Ford Mustang hoodscoop to the hood (I don't remember which year Mustang, but it was recent.) This is a Ford-approved adhesive, which means it was tested and passed ALL their spec testing. This is supposed to be a superior aftermarket structural body panel adhesive. As soon as I get it, I'm doing some in-house testing, but I think this is the stuff you want, especially if it is structural.

It is supposed to bond to paint, E-coat, primer, enamel, and bare metal. You would probably want to prime both the bare metal and hood scoop anyway. It is said to have 100% elongation; this is great for the difference in CLTE with the metal hood and fiberglass scoop. You don't want that hood looking like a rippling pond.

Translated, it will hold your scoop REAL good, even with residual stress forces (but do try to get rid of as many of those as possible by bending back as MARTINSR suggested).

I won't know the name it is marketed under until I get it; I just know the formula. I'll get that info to you probably early next week when I get the stuff.

Crankshaft