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Hard Block is a tried-and-true option for sure.

RokBlock can be literally poured into the coolant jacket area just like pankcake batter (do not fear that's too thin and intentionally mix it thicker than recommended). RokBlock is available through Competition Products exclusivlely, and is priced notably less than Hard Block.

My vote is for RokBlock. Whichever you choose, proper cleaning and prepping of the coolant jackets is paramount.
 
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