When I had my '87 Bounder I had to have the factory headers replaced a couple of times for cracking. I think twice on the driver side and once on the passenger. I think it was covered up to 50,000 miles. I then put Doug Thorley headers on it and the ceramic plug wires and never had another issue. Sold it at 95,000 miles.
2001 34' Alpine Coach
2008 Jeep Rubicon or 2012 Ford F150 4x4 Lariat towds
or a couple of different trailers
Retired in Apple Valley, California