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Hi how can i convert my 1976 4.2 damlier jagaur coupe from leaded fuel to unleaded fuel

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The main difference is the non-lead version has hardened valves and seats in the cylinder head and a catalytic converter in the exhaust. You may be able to obtain a later head that fits this engine. The converter is an easy splice-in by cutting out a section of the exhaust header pipe and fitting suitable connectors. If you need to pass emission regulations, then it gets more complicated.

Posted on Oct 08, 2009

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A 1976 is already engenered for unleaded fuel

Posted on Oct 08, 2009

  • yadayada
    yadayada Oct 08, 2009

    all 1976 model cars and trucks have hardened valve seats in stalled so they can burn unleaded, am a smog tech and know this for sure, so any money you spent will be for parts your engine already has, so why the poor rating??

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How do i convert my 1976 4.2 damlier from leaded to unleaded fuel


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1 Answer

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Hi,

Am afraid nothing much you can do since you have to make do with what is locally available. However, a couple of things you can keep in mind:
1. Using leaded fuel with a car intended to use unleaded fuel would destroy your car's catalytic converter faster than normal wear and tear;
2. At times unleaded would be available, pls use as much as possible to help clean/remove the lead additive, tetraethyllead that will cover some soft engine parts with the lead-containing material;
3. you may have to tune your engine's timing to compensate for the leaded fuel.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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