VAC Motorsports Stage 3 N54 ported cylinder head pictures

VAC has done a lot of cylinder head work on various BMW's but there is little data for whatever reason.

The last time we saw anything concrete was this dyno of a single turbo with the Stage 3 head: http://www.bimmerboost.com/content.p...t-single-turbo

Definitely a nice gain up top.

Here are pictures as to what it looks like. Wish we could get more before/after results:



Stainless steel Ferrea race valvetrain with titanium retainers.



Blueprinted and polished intake ports and valves...




Blueprinted and polished exhaust ports and valves...



Combustion chambers...



CC'd with +0.5mm exhaust valves...