......is what they call this engine filler. It's some sort of hardening non shrinking cement that you pour into your water jackets while the block is flipped on the stand.
Your cooling will dramatically suffer and your engine won't be streetable anymore. I have no experience w. hard block, so someone else might give you more on this.
BTW. The MEL 430 cid 300 HP 10,1 : 1 compr. engine rec. 0,170" min. cilynder wall thickness in its' shop manual. Sorry to hear your NOS block suffers from core shift.
Good luck
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