Re: 1971 Buick 455 GS F/SA G/SA Build
 

Thanks, I have tested Aug 19. In F/SA trim I ran 11.40 with zero tuning at Pueblo Colorado 4800 feet elevation, 25.10 baro, 7240 DA, .9508 correction, running the Turbo 400 with 4.10 gears. My next change is testing different carbs, a metric trans and 4.30 gears along with a rear end redesign. I really wish I had the time to really get after this combination I think it could really run.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

You ran 11.40 actual et? What is the index at that altitude then?
Call me..Can't find your number ..Have an unrelated question for you.
602-769-0346

Re: 1971 Buick 455 GS F/SA G/SA Build
 

The index at Denver for F is 12:60 would have been #1 qualifier at the last national with that run.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

The F/SA index for Pueblo should be around 12.46 a run of 1.06 under at altitude is very impressive!

Re: 1971 Buick 455 GS F/SA G/SA Build
 

Pueblo is about 1000 feet lower than Bandimere, but I'am sure I can run 11.60s there.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

Great news
I know finding time is key
Same here working on my velle and GS too.
Better get outside now.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

I don't know the index in F for Pueblo, although the NHRA correction is .9508. 11.4 X .9508 = 10.84 not earth shattering.....but I'am just getting started. Stay tuned.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

11.40 / .9508 = 11.99

Re: 1971 Buick 455 GS F/SA G/SA Build
 

Dwight,

Hunter was taking his run back to sea level with the .9508 factor. That's what that factor does. You divided instead of multiplying. As an example, the factored Index for Pueblo, 12.46 x .9508 gives you the sea level Index of 11.85.

Lots of people who aren't "altitude runners" get these factors all confused.

Jerry

Re: 1971 Buick 455 GS F/SA G/SA Build
 

I thought the index was 11.40 and was translating to the altitude factor. If the uncorrected index is 11.85, then the altitude factor is 11.85 / .9508 = 12.46