| my 748SP made 100HP with 50's
they came as standard on the SP's but they also came with hot cams and stronger conrods.
I would not think it would be worth going larger than 50mm on a 748.
and they will be more available.
I sold mine for around 500 when I went to a 54 on the 996
all depends how much you want to spend.
but if money is no object then get a bigger engine and start on that |