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Dave Koehler
10-22-2008, 08:11 AM
The ProMag catalog is a little confusing on the base length of the Chevy bases.
I would like to know the base length based on the adjustable collar.
Short to long lengths of the 7908, 8139, 8149

Thanks

msdtech1955
10-22-2008, 09:22 AM
8139 7.75 from collar to the bottom of the gear ...( with 1.5 adjustment )

7908 and 8139 is the same as the 8139


the real difference is , that the distance from the collar ...up ...
...but look at the length ( b setting on the catalog)

7908 ------11.12
8139--------11.71
8149---------13.28

what drive and motor do you have .

Dave Koehler
10-22-2008, 09:42 AM
Thanks.
Is this the short distance or tall distance you listed?

msdtech1955
10-22-2008, 11:52 AM
it's the shortest.... what intake arrangement are you working with ?