yes the b16b intake cam has 2 engrave rings, but be careful, i heard b16a cam for automatic transmission simillar to b16b cams..
best way is to measure the highest lobe of its cam.. IMO..
b16b(intake) highest lobe is 36.8 mm (same as b18cr 2000/2001 spec)
b18cr(intake) 98spec highest lobe is 36.6 mm
b16a(intake) way shorter than those 2 mentioned above.
wahahaha sorry if my data isnt accurate, coz thats what i can remember.. :)
-peace-