There is a guy on the 400 site that ported his head and had a cam made for his 400. He also did some other stuff but only has around 500 into the motor. he runs mid to upper 12's at the drags all day long.
Rathdrum Idaho
1971 Kawasaki g3ss
1972 Yamaha R5 350
1965 Suzuki Hillbilly
1964 Yamaha 125
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