Thread: 410 FE Propane to gas conversion.

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Looking to convert a 410 merc that is currently running on propane to gas. The engine was built for propane, and I've no experience with what must be done.

The engine is in a 1970 Ford, so the wiring shouldn't be too hard to tackle. I'm not interested in tearing the engine down and swapping out the pistons, but uncertain what head work needs to be done to get the right compression ratio.

Any advice would be much appreciated.

Thanks!

Thanks for the reply Denny.

Yes, will throw a new intake and carb on it.
Approximately 30k for miles. Oil pressure is great.
The fellow that built the motor recently passed away, so I'm not certain what the engine specs are, but I would imagine it's at least 12:1 right now. I would also assume that the intake valves have been restricted? is it possible to get the compression ration down to at least 10:1 without having to swap pistons out?

Denny,

It's definitely a 410. The Ford truck came with a 360 from factory. This engine was pulled out of a 66 merc and rebuilt to run on propane, which is why I'm pretty sure its going to have too high of compression for pump gas if I just throw an intake and carb on it. I've also read that the intake valves are restricted if it was done right--which is how this guy built everything he put his name on.