340 exhaust heat shield needed for Van's to repop.
I bought a reproduction heat shield 15-20 years or so back still bolted onto my 340. They were reproducing them and they were readily available years back. Maybe the stamps wore out? Just like 340 manifold were reproduced then stopped. Don't know but I think people will pay up for reproduction 340 manifolds and heat shields. I think buyers are out there.
As far as cost, buy heat shield for hobby car probably last forever on car thats only driven in nice weather. So one time expense most likely. Spark plug wires will be a lot happier thats for sure.