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RB30 Block Mounts (PCBM-4) There is also a valid argument for the use of a similar metal when it comes to the main caps and expansion / contraction of dissimilar metals when you consider a billet cap., different metals expand at different rates, Cast Iron blocks should have cast iron main caps. Aftermarket diffs crack blocks! its a fact, the Platinum Block brace will not only stop block twist, but stops the diff snapping the block under load, energy is dissipated through your 40mm thick integrated and webbed brace, blocks cracking and snapping become a thing of the past! Please contact us for any questions.