that hp chart an the calculators on TCI's website dont jive. On Fletchers he says the numbers listed are "net" hp and you X's by .85 to get required rearwheel hp. When you do that I believe the #'s are very low. I think the #'s in the chart are rearwheel hp already and that would jive with TCI's BUT I could be wrong!

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64GALAXIE 347 STROKER 12.65@107mph