1970-472 rebuild "with benefits"

[The Tassie Devil(le)]

One has to remember that in the advertising "Wars" back in the day of the Muscle Cars, every manufacturer over-stated what the numbers were, in a lot of cases to get bragging rights.

I remember that when the NHRA used advertised figures to set classes, some manufacturers in the stock classes found that their cars were competing against cars with more power, simply because the makers understated their figures.

I recall where GM totally understated the figures for the high-powered Corvettes, like the L88 and the like, and when these engines were actually put onto Dynos, they produced more power than advertised.

It was, I believe, the reason for going to the change in measurements in '71, as the ultra-high figures were really annoying the Insurance Industry and the safety-conscious individuals.

Bruce.

[35-709]

"If I want to go faster I have the 73."

Yeah, I hear ya!   

[Cadman-iac]

  That's true Bruce, I remember them fudging the numbers to hide it from the insurance companies, and I'm sure they went the other way with other vehicles to make things look better than they were to prospective buyers.
I forgot they dropped the  compression in 70, I was remembering the 69 stats as I had a 69 'vert back in 80's.
So the advertised ratio was not far off from the actual ratio that Greg came up with. The confusion was all on part.

  Rick

[Big Fins]

'70 was the last year of the high compression engines. '71 was downgraded. That's why the '70 is the sought after Cadillac engine to 'build'.

[scotth3886]

One has to remember that in the advertising "Wars" back in the day of the Muscle Cars, every manufacturer over-stated what the numbers were, in a lot of cases to get bragging rights.

I remember that when the NHRA used advertised figures to set classes, some manufacturers in the stock classes found that their cars were competing against cars with more power, simply because the makers understated their figures.

I recall where GM totally understated the figures for the high-powered Corvettes, like the L88 and the like, and when these engines were actually put onto Dynos, they produced more power than advertised.

It was, I believe, the reason for going to the change in measurements in '71, as the ultra-high figures were really annoying the Insurance Industry and the safety-conscious individuals.

Bruce.

GM's 'brand P' did it up and down the line.  Manufacture F advertised the 428 CJ and SCJ at 335hp and then the milder 428 at 345hp in the full size.