Gasket mating surface

[darrenjlobb]

As dave said, give it a good going over, it needs to be bare metal for good seal....put rags down the bores, and give it hell, ideally with a flat piece rather than a flapper wheel just incase you go a bit mad / make a low spot..but tbh I normally just do it by hand if im not getting it decked, and am yet to have any issues...get rid of all that black crap though for sure...