GSONFIRE

Hi

Found a photo of the changes of the years, just wondering what the changes were between the years?

Thanks

GSONFIRE

And how the 60-70 had the most HP and tq? Higher compression?

rikard

Engines were rated Brake Horse Power (BHP) before 1971. Brake Horse Power was without accesories or the stock exhaust.
After 1971 they used "Net Horse power" which is the HP with the engine as installed in the vehicle.
Regards
rikard

GSONFIRE

Brake horse power is what's at the wheel, thats what Britain uses. Net is at the flywheel, that's what North America use.

I couldn't anything that shows the differences between the years, and it doesn't make any sense how ford dropped like 40 HP.

sylver91

Emission restrictions basically.

Scraptor

http://en.wikipedia.org/wiki/Horsepower

The testing procedure changed to include all engine driven accessories, full exhaust, and pollution controls.