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the 318 V8 uses 87 octane

383 2 bbl. uses 87 octane

383 4 bbl. uses 93 octane or higher

440 4 bbl or 6-pack uses 93 octane or higher

426 hemi uses 93 octane or higher

If you still have the stock heads on the engine and haven't had hardened valve seats put in them you need to use a lead additive in your gas.

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