Ford Falcon: Converting to unleaded

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I HAVE a 1984 XE Falcon six-cylinder sedan with a 4.1-litre cross-flow alloy head. I bought it new and it's done 170,000km. I run it on LRP, but was wondering if the motor can run on unleaded petrol, or do I have to do some modifications to the cylinder head and put upper-cylinder lubricant in the petrol and so on?

Answered by CarsGuide

12 August 2004

Carsguide.com.au

TO RUN it at its best on unleaded you should fit hardened valve-seat inserts to the head, lower the compression ratio and retard the spark a little to suit the lower octane rating of unleaded. You're talking about $1000, so I'd think long and hard about doing that on an old car like your XE. I'd run it on unleaded and add an upper-cylinder lubricant.

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