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the average piston assembly steel rod grows .040 when it gets up to temp so the heads shelf area must be at least that far away from it ( CLAY THE TOPS ) with a flat or dome piston - caution about Zero decking on a street motor as it only gives you one rebuild the one your doing < most decks once cut the .020 to .030 needed to square the top of the block so it can be bored parallel to the crank, are now subject to cracking and moving as its now thinner, and every time the motor warms up and the head and the block are moving in different directions across the head gasket wear is going on < we try to leave enough to re do it if needed again - also the main reason you want it decked is to get the cylinder tops and crank pin at the same distance away from each other < we use a block mike from the crank saddle to the top of the deck, and you would not believe how off most really are sometimes, as much as .020 front to back, we take the shortest corner and cut all to its # as a distance , use a good shop and they will do whats needed buying a mike not really knowing how to use it and not knowing the correct location to measure from is a thing -- but knowing the right question to ask is sometimes a better tool to have - jz
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