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Why would you deck a block and then use a thicker head gasket? Wouldn't the clearance be the same because the piston needs to be modified to be flush with the block at top? I figured that they were shimming the rockers to use the same pushrod, but I don't know. If you shave off the heads I can see that, but this is for a decked block.
never heard that term used before so I don't have a clue what it really means.
it might be referring to the machining done to the intake manifold when the block is decked a lot to keep the intake ports aligned but that is just a guess on my part.