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Originally Posted by GSXRJJordan
Depending on which head gasket you're using, the block might not need much prep at all... Cometic's generally require mirror-finish type of mating surfaces, while the JDM gaskets (Apexi, Tomei, HKS, Power Enterprise) are much friendlier.
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Agreed, if you have no detonation on the block/head (looks like pitting) then you can usually get away with using copper gasket spray on the cometic and scotch bright+brake cleaner on the block/head, it will get it really clean.