Thread: SBC 350 build

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you want to deck the block when you know the CH of the pistons your going to buy or have C.H is compression heigth pin center line to the flat part of the piston .i messure the deck off the BHJ tru plate .i seen decks up and down hill and off on angle from side to side .the BHJ tool is centered thu main s and cam bores this gets the block back to were it needs to be .not doing this your building a block no better then gm or the maker of the block .i have seen blocks off over 018 from side to side from main to cam to deck .when i get the deck were it needs to be then i put the bores 90 off the deck .this is the only way to build one.in photo you can see the part of the BHJ thru deck the angle this what you set up the cutting head to so then your true .push rods . heads .intake . piston bore are as good as they can be now that you have some place to start thats true .some boring bars mount off deck and some off the oil pan rail .if deck or oil pan rails are off and they are .... your bores will be off that why i deck them first