1FZ A1 HEAD STUD
- Model : HEAD STUD
A1 cylinder head studs are able to prevent head gasket leaks that other highly marketed brands of engine fasteners cannot. This has been proven over and over by engine builders and auto enthusiasts who purchased other brands of head stud kits only to experience chronic head gasket leaks. They ended up replacing those highly advertised aftermarket head stud kits with A1 head stud.