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#18 (permalink)

01-26-2011, 12:15 AM

PDUB

CC Member

Join Date: Jul 2003

Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader

Posts: 1,132

Not Ranked

Quote:

Originally Posted by mikeforte

BTW, I believe that Ford went to 6 bolt because they knew of the 302 and most likely knew of the 351-W and the increased power would be better behind a more stout 6 bolt pattern bellhousing.

Whether or not these were on the drawing table in '64, I don't know... that seems a little early.

Quote:

Originally Posted by mikeforte

Remember the 5 bolt 289 started as a 221, 260 and then 289.

My point, exactly Mike. And as the power grew they may have started to see issues with things coming apart, especially with racing. Thus, they made a change in the back end of the engine.

I was hoping that someone with some inside knowledge would post on it...

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