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Guys, somewhere I've read that there are propane or NG heads for our 4.6l engines; anyone know anything about those?

One of my friends in Germany did a conversion, and it was interesting...

Anyone heard of someone using one of these engines? They were in Taxi's or something...
 

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You could get CNG Crown Vic/F-150s/Expeditions with the 4.6.

I don't think the heads were/are different. They had a crazy all aluminum intake that was very similar to the early 4.6 one with the forward facing TB.

I live close to the airport, which is the biggest and easiest way to get CNG for a vehicle, so I looked for one, however they want crazy money for the good ones, or they are at the age that the tanks are no longer certified and need replaced. They are used big time at air ports.

The conversions are a totally different animal.
 
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