OK so I have a 2000 Si that had a b16a2 motor in it that I built and then sold....then I replaced it with a JDM b16a motor that I am driving around on now. Sitting in my closet is a USDM b16a motor that I am going to be having sleeved in the next few months for my new build.

What my question was is there really much difference between the USDM b16a and the USDM b16a2? If so, what? Reason I am asking is b/c I am getting a Helms manual for my car, but didn't know if the torque specs for the b16a2 would be the same as for the b16a? Or do I just need to also get a Helms or make copys of pages from a Helms that has an older b16 in it? Thanks.

 

all the usdm's b16's are the same

 

so the numbering between the two are the same? all mine says is b16a.....

 

if it says b16a then pretty sure is jdm.on the 1st gen b16 some torque specs are different, but main ones are still the same.

 

ony b16's in the US is b16a2 or b16a3.