Does anyone know what relief valve I should be using and what length the spring should be? It seems OK but I'd like to double check
Mine's not.AS41 is dual relief
It's not one of them. It's much older than 2006, maybe pre 2000. It says AS41 Brazil and has VW & Audi logos on it.If your case has only 1 relief valve mite be worth you reading this
Cheers, I wasn't worried about using it I guess it's just a standard single relief spring and valve then?There was a hoo ha about these cases, but they are easy to use. A little machining on the cooler seal holes, to fit the twin port cooler and even a long drill down the (looking from the side) left hand feed hole. I have a 10 year old, 135bhp engine running on one of these cases. No probs.