Okay so I was racing a douche in a bmw and bent my valves so I got a rebuild on my head. After putting the head back together and driving gentle for about 250 miles I noticed at 6k rpm my lift wouldn't engage and the car would strain. I cant figure it out its pissing me off. Put new oil and everything and still lift wont engage. Any ideas? Is something unplugged? ECU missing something? help, this is pissing me off.