i have just had my engine put back in my car after totally restoring the bodywork. it started first time and run for ten mins then was left. when it was tried again it would not start at all. it turns over, sparks and there is fuel there but it will not crack up. i had new valve stem seals and rockers fitted 2 years ago before i started to strip the car. the mechanic thinks that the piston pressure has caused the valves to stick open and not release, the top end has very little oil in it but he says it is not seized.anybody got any ideas even though the car has been being rebuilt i still had the engine running every week prior to removing the engine to do the last bit of retoration in the engine bay and the car was driven to the garage to have the engine taken out (engine was taken out and refitted within 2 weeks) all levels topped up and checked prior to first start up of the car