Hi as far as im aware ports make a bit of difference on different engines but I think the os speed is only a 3port engine and revs to 40,000 rpm, but are a really powerfull engine a friend at the track has 1 and it blows all the other engines away both bottom end and top end compared to 5 ports and 7 ports, so buying an engine just for ports isnt the be all and end all theres tuning and gearing to take into account thats how I see it someone might see it completely different.
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