20-11-2019, 09:48 AM
I'm presuming, having now been given an original new 1940s HG so I can SEE/feel the difference in materials, that if modern HGs are now essentially seen as single use for safety, then that suggests that the coppersilicone type sealant becomes a necessity on unrestored engines. When I used the coppersealant, it just seemed something which meant it was more difficult to get the HG off when you had to do a head removal - but it seemed from feedback that people didn't seem to decoke anymore with modern fuels.