VALVE GUIDE SET (8) BRONZE TYPE

New colour, PB104 bronze guides.Although Silicon bronze valve guides were used for their extremely good wear values, they were very hard and not user friendly when fitting. These valve guides are recommended when using all EN21 4N stainless steel valves. Exhaust valve guides should be opened up 1/2 thou (0.0005")more for valve. These can be used for Pre 2012 8 port heads but will need circlip grooves machined in plus shortening where required. See C-AHT364 for guide with groove and C-AHT365 for clip as used in our 5 port alloy heads. Our York Depot is the main contact for anything concerned with 8 port heads