I would say that you are getting fairly close to the cylinder studs and so yes you may suffer from heat as at those points the cylinder wall is thin. They may of tried to compensate with more metal around the studs (i'm not sure) but whatever you do this has to be the 'weak area' of the large bore kits.
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i dont really actually know exactly how relavant this is as yet but ,on all cast lambo barells the studs are exposed...to cool air.
this is so on all std vespas.
on most (if not all)ally kits for lambos they are inside,and so Not exposed to cool air.
while again on vespa kits wether cast or ally they are still exposed.
could this make a difference.....?
i see.. interesting. malossi 172 t5 kit has exposed studs tho. But i'm reckoning it could be to do with more metal for anti seize.. or port angle maybe.
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