[Tigers] The Snake Oil Truth

[Jeffrey Nichols]

 "Yeah, but wasn't that questionable?  271HP with the Ford Motor Company
engineering, vs. Shelby's California street rodders getting 306HP with just
a few minor tweeks..."
 
Shelby was able to do it back in the day.   Mustang Monthly did a dyno test
between a HiPo 289 and a Shelby modified HiPo.   Here is the result page and 
the HP ratings are close to what Ford and Shelby said they should be.  Read
the rest of the article for the full story.
 
 
 
http://www.mustangmonthly.com/techarticles/mump_1003_1965_hi_po_engine_versus
_shelby_289_short_block/dyno_test_results.html