That one serious loophole you left yourself to back misinformation.If the GT40 car weighs 3000 pounds or less, sure it will. I specified it needed to be lighter than stock.
You could use that excuse pretty much during any debate.
BTW, if you figure in that you lose 50lbs with aluminum heads and each 100lbs is worth a .1 (so is each 10hp added), the extra 40hp you get from the twisted wedges still outruns your 3000lb car with iron heads and that guy didn't have to turn his car into a stripped down POS to do it.
And in the future to be fair, IMO when comparing the performance of certain parts, it should always be under the same conditions.
The gt40 iron setup is the worst bang for your buck mod. You know why? Because you spend money and you still lose to basic modern muscle cars. You could spend zero and get the same result, a loss...
There is always a faster car, but if you can't even compete with basic showroom sports cars, I don't even see why bothering doing it at.