Not Ranked
Hotfingers,
Hardblok is mostly cement, with some Iron granules added to get the CTE to match the block better.
I suspect the filler in the blocks in question is similar, unless they were filled a long time ago, and then it might be just cement (?). If they've been run that way and the filler is not cracking away from the walls, its probably OK.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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