Quote Originally Posted by VTi_b0i
what is a b16a4? i have seen this advertised in hot4s from a place called tweak it i think...
anyone correct me if im wrong, but..

essentially there are only 2 variants- B16a1, and B16a2.

HOWEVER, jdm only uses 'B16a' in their engine #, so the next number will tell u what car the engine was put in.

I know for sure that 'B16a5' is a JDM SiRII, so logic would suggest that an 'a4' is perhaps an SiR, or perhaps a Del Sol..(?)

Easiest way to check whether a1 or a2 is to look at rocker cover (if still original). An a2 has 'DOHC' in small letters, whereas the a1 does not.