orginally we thought my turbo was bad cuz the car smoked at boost now we've checked the turbo and it has no shaft play but a new problem has come about the car now has a rattle or slight knock sound coming from the head the oil is fine and we pulled the valve cover and checked everything topside pulled the plugs and check those they were also fine. does anyone have an idea as too what i should check for or has this been an issue for anyone before? motor is a stock sr20 with front mount on stock psi any feed back would be greatly appreciated thanks

Dennis