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F7 helix

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Got my performance manual last night !
It says 51/53 helix for F7 ( doesn't say sno-pro or std.)
I have a std. and it has 53 !
Does anyone have std. suspenion and the 51/53???
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I belive the 53/51 is for the sno-pro and the 53 is for the standard, which is what my standard has in it. The reason is probaly because the 1.375 track sucks down the rpm on the top end and the 51 deg angle allows the rpm to stay at peak.
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