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1978 engines were set up to run on unleaded fuel. You can run unleaded,,and I would recommend running the mid-grade to help prevent pre ingnition as motorhome engines work very hard and are running at high tempratures most of the time.

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12y ago
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Q: I just bought a stock 1978 Ford 351 Windsor and installed it into a motor home What octane gas should I be using?
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