Paul,
Here are some dyno results of a 13b "P" port engine at lower rpm.
48mm "P" port rotor housing, 18" intake runner, 33"X2" exhaust
Carb. n/a
4,000 = 122.4 hp
4700 = 160hp
I have numbers all the way down to 3,000 and as high as 7,500
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