[Dan Fahey]

$20000 heads maybe one way performance has improved.
Only going to get so much out of the heads.
Be interesting to compare Ported Stocker heads to $20k massaged.
Guessing 20 to 50 hp from bare Stock heads.

There are other technologies that have made our cars quicker.
Such as better lubricants, composition of engine materials, tighter tolerances, treatments on bearings, cams and springs and of course Lifters, rings and pistons.

There are better tires, VHT coated tracks for a heck of a lot better launch.
Got Converter and Transmission technology putting power down more effectively.

I am sure that $20000 heads helped a lot.