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i happened to see my brother out whilst driving, and then burned him off at the lights (he has a 200sx 2ltr turbo nissan, lol) but he said that when i got to the top of 1st gear (about 6000rpm (and i was 1.5 car lenghts ahead of him!!)) a small puff of blue smoke came out the exhaust, any ideas? he said maybe value stem seals?
i have a 1.5 carb only engine mods are a light weight crank pulley and a twin choke weber (not for bragging rights, just to see if this is of any relevance to the problem (but still, i whooped him))

thanks, pete

anyone?