Josetein,
Ford changed from a 28 ounce imbalance correction to a 50 ounce
imbalance correction on both the flywheel and the pulley.
You are correct, the bolt hole change is to prevent mis-match. The
starter and starter ring gear also changed.
If you are using a later 50 oz motor, and still need (as you will) the
Tiger fan blade set-back (and water pump and generator) you will need a
pulley with 4 bolts that is the same set-back as the 3 bolt TIGER one
(unique). There are Ford 4 bolt pulleys available with double shives,
and one lines up. The other may have to be cut off on a lathe.
Replacement dampers are available in 28 oz and 4 bolt from performance
after market sources, but they are not cheap.
Part of the game of engine switching
--
Steve Laifman
Editor
http://www.TigersUnited.com
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