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Discussion Starter · #1 ·
I am attempting to modify a 76 hood to raise the center "cowl" for clearance and installation an underhood airbox. Planning on cutting the center section free from the rest of the hood and filling the resulting 1 or 2 inch gap with sheet material.

My question is this: Should the sheet material (used to fill the gaps) be SMC sheet and if so, where do you get it? I'm thinking bonding strips might work?

Bodywork is not my "specialty" so all advice is welcomed.
 

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Yes I would definitely use a piece of SMC to fill the gap.

Where do you get it SMC strips?
Wish I could answer that question never had to buy any.

We always made our own from the old panel when sectioning in
a new piece. Obviously you don't have that option here.

A bonding strip would work fine.

What you can do is get a used door off a Lumina APV or
bed side off a '90s step side Chevy PU. They are both made
of SMC. Should be able to get it cheap if it already has damage
on it. Sometimes the advantage to this is if you need a piece with
some curve to it, the bed side will offer this. And should be about the
same thickness as the hood.


There are a lot of products out there for SMC. One of the ones we
use the most in the shop I work in is 3M Panel Bonding Adhesive.
It can be used along with the fiberglass mat or cloth with very good
results. You don't have to have the applicator gun. Just dispense
the contents keeping the two tubes even with one another and you'll
have the proper mix ratio. I have used a wooden dowel when I forget to
bring my gun home.

 

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I would like to do this some day. Bought a junked 76 hood and I want that mildly raised cowl induction look. It would be great if you could update us on what you used to cut the hood, where you made the cuts and how you reformed the shape. :cheers:
 

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Discussion Starter · #4 ·
Yes I would definitely use a piece of SMC to fill the gap.

Where do you get it SMC strips?
Wish I could answer that question never had to buy any.

We always made our own from the old panel when sectioning in
a new piece. Obviously you don't have that option here.

A bonding strip would work fine.

What you can do is get a used door off a Lumina APV or
bed side off a '90s step side Chevy PU. They are both made
of SMC. Should be able to get it cheap if it already has damage
on it. Sometimes the advantage to this is if you need a piece with
some curve to it, the bed side will offer this. And should be about the
same thickness as the hood.


There are a lot of products out there for SMC. One of the ones we
use the most in the shop I work in is 3M Panel Bonding Adhesive.
It can be used along with the fiberglass mat or cloth with very good
results. You don't have to have the applicator gun. Just dispense
the contents keeping the two tubes even with one another and you'll
have the proper mix ratio. I have used a wooden dowel when I forget to
bring my gun home.
Thanks for the tip on the Lumina and Chev PU.

One more question. Which is best:

New piece butt joined and then glassed over or new piece butt joined and then backed up (lapped) with another piece?
 

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Which is best:

New piece butt joined and then glassed over or new piece butt joined and then backed up (lapped) with another piece?
backed up (lapped) with another piece

Definitely go this route being the center of the hood will be a high
stress area......with opening and closing.


If you do find a used bed side.......it just bolts on......easy to remove.
 

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I did this a few years ago to an L88 hood. After cutting off the hood scoop, flipped the hood upside down and used thin aluminum strips to position the scoop on the hood (the aluminum was on the outside). Then just glassed in the gap. After the fiberglass set up, I removed the aluminum and used bondo-glass to finish it on the outside. It was a $90 swap meet hood and it worked out okay in the end. No problems with cracking.
 

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After you cut your pieces of smc to fit they will have enought flex that It should make for a pretty smooth and easy fit.I will usually make template first out of card board or poster/foam board and build it with a little tape first.This way you will have the right cut on your pieces of smc.(Easier to redo the card board than to make a bad cut.):thumbsup: Take pics for us!
 

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No need to rob bonding strips off of something else. Make your own 'pre-cure' strips. Estimate how large the pieces need to be, then lay up 3-4 layers of heavy fiberglass mat with SMC resin. You can lay them up on a waxed piece of glass, stainless or even plastic laminate (Formica, etc.) After curing, cut the pre-cured pieces to shape using the cardboard template. Bond these parts in place and back up with more mat. Good luck........
 
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