Just bought my first movie a 55 split screen and was putting a new carb and three branch manifold and I think one stud came. Out and will not go back in, so assume it has cross threaded. can I run the car with one stud missing at the exhaust manifold?
NO! What engine is in the car? Just fit a new stud - 5/16" unf thread. Often with a 3 branch - the two end studs are changed to bolts for ease of fitting....
998 ??? You NEED all the studs..... A '3 branch' exhaust is not going to benefit an otherwise standard 948 (??) engine - quite the opposite possibly......