CNC porting of Porsche 911 air-cooled heads is something we do a lot of. Everything from mid-1960’s to late 1980’s heads. We supply a lot of engine builders with heads for these. Seat and guide replacement, welding of damaged heads, CNC porting, hand porting, manifold matching, all sorts. Whether it is a 2-litre control spec or a huge valve 3.6-litre build you require it’s not a problem.
Here are 3 stages of repair to a blown up 911 cylinder head:
Stage One:
The damage to the head is tig welded
Stage Two:
The excess material in the bowl is then machined by CNC
Stage Three:
The seat inserts are fitted, profiles cut and top faces decked to precise heights
