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Many engine builders don't recommend running top lube in high compression Sprint Car engines! You need the fuel as hot as it can get and as pure! As far as the secondary, get rid of the Hilborn poppet type and use a Kinsler diaphram type like you would for your Hi-Speed. We use the regular Kinsler on the secondary and an IRL on the Hi Speed with good methanol and no top lube and have zero problems!
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