How can you tell the difference between a b18c1 cylinder head from a b18c5 cylinder head? (besides the read valve cover?

my roomie just baught an integra with a engine and i cant figure out if its actually a type r, it just doesn't seem as fast. Its a GRS body with a engine with a b18c5 block (says so right on it) just wondering it is actually a type r or its some hybrid thing he threw together. it has a del sol tranny so you never know. Thanks.

 

on the front side of the
gsr head should say p72-1 or p72-2 and
on the type r head it should say p73
if its si it should say pr3

 

what kind of car does he have? Is it a type R?