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What was the purpose of leaded gas hy don't we need it any longer??
Brother just purchased a '64 T-Bird (390 cu in) and is wondering what type of fuel to run. He had one back in the day and it needed premium or he got spark knock. Our discussion made me realize I really don't know why gasoline was leaded, nor why it doesn't need to be leaded now.
Oh...and what type of fuel he should run is an open question too 
He lives near Milwaukee and typically has access to only re-reformulated gas. Don't know what re-reformulated is...don't sound good though.
Thanks, Bob
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87 Turbo Limited-full weight: 40k miles...LS1 MAF, Limit TE45a, PTE FMIC, 75's, Micale Ported Heads, THDP, ATR 2.5" Duals, Yank 3000, Lonnie Diers 2004R, T+ w/Extreme Chip, H&R rear sway bar. 11.30 @ 121 w/1.69 60'
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