Identifying engine code

[Notorious_T]

Quick question, I have a type r in my civic and was wondering on the block the engine code is b18c5 that I know but im wondering were would I find the code or number for the head?

Thanks

 

[Notorious_T]

nvm got it....

 

[eg6sir]

if it were a type r head it'd have a pr3-X .. X=1-4