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Re: Engine Upgrade on my 71 !
External balanced:
http://www.summitracing.com/parts/SUM-G102SFI/?rtype=10
Vs.
Internally balnaced:
http://www.summitracing.com/parts/SUM-G100SFI/?rtype=10
See that weight welded on to the externally balanced one? Thats what you're missing. A relatively easy fix, it's just going to involve pulling the transmission to change out the flexplate.
http://www.eaglerod.com/index.php?op...d=27&Itemid=25
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passthebuck 
#5642
-TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4.
-a 2013 Honda Civic as my "sensible" car
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