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Discussion Starter #1
I Locking for Hi-comp head to the rotax 503 engine.
Do you know about a site where I can find it?
or is it a other way to get more power from my 503?
 

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a 503 fan!, the best way to get power is to buy a liquid cooled sled

503 you could measure your squish and shave head as needed, but being a fan I have no idea how tight you can go??
 
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