Tutorial: How to make engine part 39

Exhaust valve seat
Step 1:
open a sketch on the front plane
Step 2:
draw an axis
Step 3:
add these lines
Step 4:
continue to sketch
Step 5:
draw a centerline
Step 6:
use revolve command
Step 7:
show the sketch
Step 8:
use linear pattern command
Step 9:
use the axis for the direction. enter shown volues and confirm that
Step 10:
use linear pattern command again. use shown values
Step 11:
save the intake valve seat part