Wondering if someone can help I had my 2wd cosworth head valve guides replaced and a port and polish job, after refitting the head and driving it for around 1000 miles on the road it started smoking again so the head went back to the company that did it and both exhaust guides had worn like it had done 50-60,000 miles. So they where replaced again. I've done around another 1000 miles or so and it's smoking again, I've had the turbo and exhaust manifold off and you can see the oil on the guides again on number 4. The head is due to come off and go back again!!! Can any one help please