i need extra cooling. Whats out there?

[WhatsTheCraic]

Hello folks

I'm running a 2 litre (CJ) bay camper van off LPG instead of petrol (LPG is the brittish name, the rest of Europe calls it AUTOGAS). It runs really well on LPG but if I drive over 55mph then the cylinder head temperature soars to 400 which is pretty much its limit, so I cant go any faster Ill cook the engine. Everything else in the engine is stock, so how can get the engine to run cooler, so I can drive faster?

Also if your breaking new piston rings in, how long do you need to break them?

Thanks

Dave Hunter