What is the neck diameter on the crankshaft???

 

Too clarify what Im asking this for is that I wanna drop in a d15a3 crank in my d15b8... I found specs that the a3(si model crx) and b8 have the same main and rod journal size but couldnt figure out the neck diameter... im thinking its the thickness where the pulley would bolt up... now the a2(hf model crx) has the same main and rod size also but I couldnt figure out the neck diameter for either one... I think the a3 was an .944" diameter and the a2 was like an .865" diameter... which I think the b8's is also .865".
So I guess if anyone can clarify this for me and if the neck diameter even matters as I could just bolt up the pulley that belongs w/that crank... if im even on the right track with the neck diameter.... thanks much!!!

 

look up the front main seals for those cars and maybe that will tell you if they are the same

 

From my experience the HF engines use a smaller diameter snout and smaller inside diameter of the pulley. I say use the same pulley from the crankshaft. About the only difference after that would be belt length if the outside diameters are different.