I had some backfires when I got my 38 on the road. It split the muffler wide open. I squeezed it back together and used old license plates screwed down to secure it.
The cause was the wire lead to the condenser was sometimes shorting out on the distributor.

Wayne
1938 1-Ton Farm Truck
Stovebolt Gallery Forums
1989 Silverado
1996 Mustang GT convertible
When I die, I hope she doesn't sell everything for what I told her I paid for it!