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I have had the slp double roller on with both the stock pump with shims and the slp pump with no shims and did not have to grind anything. They are both nice parts.
Yeah the slp is modified melling 296.So thats why it shouldn't need much grinding.
I bought a melling 296 but didnt'' want to muck with it so then bought the slp combo.
I for sure wanted the added security of a double roller for my build.