LS3-Based 418ci Engine Build - Big Power, Small Budget
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GM LS3 main caps are torqued to spec in order to maintain load conditions on the block before machining operations begin. The block is then set up on a Rottler F-67A three-axis CNC machine by Heber Ramirez of Sunset Racecraft to both deck and bore it. The deck height is measured to determine how much machining is necessary to ensure a flat deck. According to Ramirez, "A production LS3 block has a stated deck height of 9.240 inches, and traditionally we see 0.003-0.005 of variability across the deck surface." In this case, the variability was quite low, so a total of three passes were taken at 0.001 per pass, and the deck height was set to 9.238 inches. View Related Article
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