b16 b18 difference?
 

how can i tell the difference between a gsr & SIR?
I bought a head off ebay and original owner said it was a secondgen
and i found out about the stamps on it...and its a 1990 the casting
reads pr3-3 or pr3-2?

second question i bought a fuel rail from aem 125-103part number
99-00 SI rail...
Will it fit onto my 1990 head? I was thinking that as long as its a vtec
head that it would fit...it has not come in yet...i know i should of asked
questions before...
NEED a little help fellers...
thanks