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Re: Compression ratios for cheap gas...
From what I hear, my 10:1 is = 9:1 at sea level. If I drive down in altitude I'll have to run premium.
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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