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Old 03-13-2007, 10:04 PM   #1
Sport/Truck
Sierra Grande Club
 
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Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
10:1 compression @ 6k feet

I have a question about running 10:1 at altitude (6k). I am using stock cast iron heads, and also want to run 87 octane gas. One shop said no, but another said yes- because it will act like lower compression IE 10:1 will act like 9:1 at this altitude. He also mentioned if I go to sea level I’ll need premium.
Is there any truth to this?
Thanks,
s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.
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