The valve seats now need to be True and Accurate, this is done on a Serdi Millennium Machine, which is very Precise and the heads have to pass 100% Vacuum test before allowed to move onto the next section.
Fitting valve seats
The valve seats now need to be True and Accurate, this is done on a Serdi Millennium Machine, which is very Precise and the heads have to pass 100% Vacuum test before allowed to move onto the next section.