[Formulajones]

The SD's and the HO's also got the compression change. It's the same change allowed accross the board, 1.5 points above advertised ratio. So you have to work with what ya got

[Formulabruce]

Originally Posted by Formulajones

The SD's and the HO's also got the compression change. It's the same change allowed accross the board, 1.5 points above advertised ratio. So you have to work with what ya got

So basically 2.5 to 2.75 ABOVE real static CR..

sounds like "stock" to me !

[Formulajones]

Originally Posted by Formulabruce

So basically 2.5 to 2.75 ABOVE real static CR..

sounds like "stock" to me !

No sir, it's 1.5 points above the "advertised" ratio. So most of your performance pontiacs that advertise 10.75:1 are allowed up to 12.25:1 compression.

That's why you are seeing your HO's and SD's peak at 9.9:1, because you start with an advertised that is so low to begin with. The increase is uniform accross the board, so as far as "stock vs stock" comparison, it's still about as real as it gets considering it's been 40+ years.