Big B NRG
Well, this is awkward
There isn't a rule of thumb for exhaustport timing - RPM.
In general the rule is, the higher the exhaustport timing, the higher the RPM, but this doesn't have to mean you get more power.
I can tune 2 cylinders; 1 with 200 degree exhaustport timing, the other with 195 degree exhaustport timing, both doing the same RPM, but one cylinder giving more HP at that RPM then the other. It depends on to much factors.
We can give you an indication; but it won't give any garantees. Post your stock timings for all transfers.
In general the rule is, the higher the exhaustport timing, the higher the RPM, but this doesn't have to mean you get more power.
I can tune 2 cylinders; 1 with 200 degree exhaustport timing, the other with 195 degree exhaustport timing, both doing the same RPM, but one cylinder giving more HP at that RPM then the other. It depends on to much factors.
We can give you an indication; but it won't give any garantees. Post your stock timings for all transfers.