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The Audi works cars ran this mod. The gains in cooling allow you to be more aggressive with timing as Jamo mentions. You can get the machining done for £150 if you look around. Doing the head and block would be a good idea, but it does mean ripping the engine out and dismantling to achieve this.
I have an unused 3B block that is screaming to have this done.
I think it a nice feature if you are going to remove the head and wanna run things to the limit. Personally would not remove the head but I would make it to the spare one.
It a nice add on and one can use this without any disadvantages.
How deep and wide should the groove be? Is 5x5mm enough? Does it work good enough on the head only, or should it be on the block also?
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
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