how much horsepower from my 318?

dodgetkboy78 said
Did they ever? I do know they started measuring it with all the accessories on in like 73........

It was 1972 when this switch was made (this is way you see a big drop in HP from 1971 to 1972. Also 9 out of 10 times the engines had no change to them so what you see in 1972 is what the 1971 engine were really making).