Ed, I see many 837 alternators with the "hook blade" , but my 837 had never been apart until I rebuilt it. It has the same fan as my 834(like you said). I always wondered if it was correct as it was not the hook type, but assumed it was because it was all original on my car when I bought it. Another post reply by JohnZ concerning 837 pulley finish started by DT shows the hook fan. Could you clarify why this is? My engine is a 396,not a Z.