Originally Posted by
RickVB
I am thinking of just cutting the whole front off the box, right behind the current firewall, along the double headed arrows above, and in the photo below. Then I think some 3/4 ply might be just the right size, and glued and pinned it might be strong enough. What do you all think?
Hi Rick,
Yes, it would have been nice if the firewall had been just a bit bigger, although in my case, any wider would have been a problem. Any new firewall should be at least layers of 5-ply aircraft birch, 2 layers of 3/8" ply if you want to go 3/4". Regular 3/4 ply would tend to be soft and allow the blind nuts to draw into it, unless you bolt from inside like I did, then a backing plate would work. I made the backing plate because there was no room for wide washers.
I have all the correct length bolts for the engine intake side, so the carb and adapters are all attached. Have confirmed the order for a custom Bisson Muffler, so that is in the production queue.