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I believe that Jim Kennedy, Paradise Performance, Matoon, ILL, has witnessed power up near there with those kits.
We have clients out there, that in fact, have 145/145 with either a re-worked 120R, or our hand-built 120"s(4 1/2" stroke, 4 1/8" bore).
Robin Theim, tuner, at Gails HD, Grandview, Mo, runs our heads on his 120.
145/145 as told to us by him.:)
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