Close-up of freshly machined valve seat and guide inside a cast-…

Extreme close-up inside a bare cast-iron cylinder head, looking down a machined intake port bowl at the freshly cut valve seat and the valve guide boss. The multi-angle seat cut shows bright machined rings with red machinist's dye still visible around the outer edge, and a second port opening sits at right.

AI caption March 2008 · Photo 235 of 240