Measuring for drive snout on 6/71/8/71

Looking to buy a drive snout for my blower case GMC 8/71,...I would like to do it only once ....after determining where the blower pulleys "sit", how is the snout measured?, from what points?....to determine the correct length to order/purchase, I know shorter is better, because the distance can be made up in spacers, I just don't want to order based on the wrong measuring criteria....


TIA
Mike

can you put a yard stick on the crank pulley yet?if so measure from the blower case to the yd stk and subtract for the pulley,if you have the blower on that is.

Thanks Mike

i am retired now so i have time to measure things for ya.to be more clear the case where the snout mounts that flat area is where to measure from.i got out and set the timing on mine today[30* locked]
http://www.youtube.com/watch?v=FsVQhHvjuGA
i hope you will be running soon to share some vids also.

Let me add,,,,,,,,,,,depending on what gears are in the blower,there are a few different bolt patterns used.Another expensive learning curve i went through

1st pic is the SMALL bolt pattern,this coupler has the multi bolt pattern.

Good to know Al,....I too want to avoid buying a bunch of parts I can't use


Mike