is there any diffrences wat so ever between 90-91 b18a1 ls motor and the 92-93 b18a1 ls motors i know the 92-93 have 10 more hp but i want to know if there is and stamp or number on the block or head that can deturnmin wat years it is??? because my buddys car is swap theres no way to tell that i know of..... if anybody knows hit me up... peace

my friend has a 91 civic si with b18a1 swap and he has a gsr tranny behind it... the good thing is the pulls like a raped ape to 105 mph but thats all the fasterhe a can go thats redlinging in 5th gear. i think that the tranny could be set up for some type of auto crossor,auto x racing or something . but if some one out the that knows alot gsr tranny and may have here or encounterd the problem it would be great to here back from u peace......