Remnants of valve grinding compound will destroy an engine ''way'' quicker than toothpaste would.Yep valve grinding compound would work even better! Personally I’d keep toothpaste far away from my engines.
Also,,
valve grinding compound ''even diluted with oil'', would leave the alum. bore finish ''very rough'',, & probably take off to much material in short order also,, potentially leaving the lifter/bore fit sloppy.
Valve grinding compound is basically for hardened steel & stainless ect..
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