New to forum and a novice in small engine repair. I acquired a GX270 engine as part of a Porter Cable generator setup with 413 hours on it and don't know the maintenance history. The engine had some slight surging issues that resulted in variable generator voltage output so I started tearing it apart to rebuild any areas of concern. On the bottom of the cylinder head I found cracking and was wondering if this is normal wear and tear in the picture below? I can't see any areas where the cracks go all the way through the head and did not do a compression test prior to removing it from the block. Is it recommended I replace this cylinder head regardless of compression test results? Thank you in advance for any help.