THE SHOP

October '19

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36 THE SHOP OCTOBER 2019 BUILDING THE Nighthawk II LS As a raffle prize at the 2018 PRI Show, this all-black beauty needed to have it all. By Mike Mavrigian OCTOBER 2019 Mid-Engine Corvette p.44 Engine Products p.48 EDITOR'S NOTE: This is the second in a four- part series following the build of a 428-ci, 631-hp GM LS engine that was raffled off at the 2018 PRI Show in Indianapolis. Part I appeared in the July 2019 issue of THE SHOP magazine. CRANKSHAFT BALANCE Our balance work was performed by AERA member Jody Holtrey, owner of Medina Mountain Motors in Creston, Ohio. Natu- rally, the first step was to determine the bobweights required. In the process, Holtrey weighed each piston, each piston pin and each rod. As expected, the Icon pistons and the SCAT H-beam rods were already well-weight- matched to within a few tenths of a gram out of the box. However, Holtrey went the extra mile to weight-match all pistons, all pins and all rods to zero tolerance, requiring only light kiss removals of a mere 0.2 to 0.8 grams on a few select pistons and rods. Again, this was not necessary, but Hol- trey's attention to detail prevailed (for those who may not appreciate these values, to put this into perspective, a single U.S. currency bill weighs 1 gram). Final piston weight was 395 grams, with all pins at 88 grams. All rod small ends were PRECISION ENGINE PART II 36 THE SHOP OCTOBER 2019

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