Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Steam technology, On mine I have what looks like 4 cracks where the bolts hold the head on.  It looks like the bolts were overtighted
And cracked the head. After seeing your pictures I noticed yours also has a crack.  Do you have 4 cracks on yours? One for each head bolt?  Perhaps its supposed to be that way?
Mine seams to run ok. Thanks