World Formula max piston size

Hi everyone I am new to the forum, I am racing a World Formula here in Australia. My question is , has anyone bored out a WF for more capacity greater than .030thou? I am a larger bloke and I would like to improve the torque of my WF, unfortunately there is not of info here on this engine any tips would be appreciated thanks.
 
@Jimbo has a nice kit for the lo206 that I think would work with the WF. Domed piston and you don't have to bore it to an unsafe size. Don't think the shipping to Australia would make it very cost effective.
 
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