My Pete rebuild

[marek4792]

My 870 did that metal screetching whenever it would hit 8000+ feet (Wyoming) then pretty much the next 400 miles after. It drove me up a wall. Mechanic who rebuilt it used a copper spray on the gaskets and/or the surfaces and it actually stopped doing it after that.. but they had forgotten the rings in the manifold so off it went again and like clock work so the noise returned..