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Gas in a 1971 Ford 200 straight 6

FrancSevin

Proudly Deplorable
GOLD Site Supporter
What kind of additives do I need to add to modern gas to run in this old motor built to run leaded gas?


TetraBoost in the tank will do it.

However,you may not need it. That engine calls for lower octane (87 ) so all you need lead for is the valve stem lubrications.

STP in the crank case might do that or you can replace the valve seats with molylibidum ones.
 

300 H and H

Bronze Member
GOLD Site Supporter
The lead helps the heat transfere from the valve head into the seat and thus the cylinder head itself. This is hampered by unleaded fuel, thus the valve and eventually the seat run hotter with unleaded. Damage to both can happen mostly durring hard pulling of the engine for extended periods. The correct thing to do is have hardened valve seates installed on the exhaust valves. I have had mixed results with additives. Franc is also correct in that this is a low compression engine with lower combustion preasures and temperatures. It may do OK on unleaded, unless you work it hard for extended periods. Snow cat operation would fit that bill though...

Do the valve seats with a reputable machine shop, and no worries.

Regards, Kirk
 
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