Structural Foam for chassis stiffening

myduster360 said
Not seeing much to be scared of guys.

Few if any disadvantages of Structural foam if used with a little forethought.

If it provides ZERO added torsional rigidity and just quiets the whole car, would it still be a worthless effort? Don't guys wind up spending much more time & money just on Dynamat.

Seriously, if torque boxes provide some benefit, so too should foaming the rocker joints.

If spending countless days disassembling the car, cleaning out all the seam sealer and adding 50lb of weld wire makes you feel better, that's awesome, but I doubt that will ever happen.

I'll be seeing if I can kill 2 birds with 1 stone.

50lbs of weld wire...thats funny.

At 30 lbs/cuft for the foam your adding at least 50 lbs in the rockers alone. The way your talking it sounds like it would be a few hundred pounds of foam before it was all said and done.
Plus as I said before I believe you'd have to have pristine metal to get proper adhesion of the foam so you'd be taking the car down even further to get it to that point. Would be a complete waste of time otherwise.
Not saying it has no benifits, but I dont see the return on time/money invested on a 40 year old car.

I'll stick with welding in some 2x3 and tubes to get rigidity.