50-55 Raptor 3/21/13 2:02 PM Page 54
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improvements to the block. Thanks to its thick cylinder walls the block can be bored and honed .065”, resulting in a final 4.080” bore size. The new pistons are manufactured by JE with a ceramic
The crankshaft is then offset ground to achieve a stroke of 3.82”, giving the new Raptor version a 6.6L or 400 cubic inch displacement. The rotating assembly is then balanced to +/- 1 gram. The block undergoes several other machining processes such as deburring of the casting on the inside and outside of the block, the oil passages are radiused and smoothed for better oil flow, along with decking to ensure At Livernois, special care is proper quench and taken to ensure that the piston to wall clearance will be besquareness with correct tween +/- .0001˝, the main bearsurface finish. ing clearances will be between After the block is +/- .0002˝, and the rod bearing machined, the rotating clearances between +/- .0002˝. assembly is installed. Thanks to modern day technology, precision machining is a given. At Livernois, special care is taken to ensure that the piston to wall coating and offered by Livernois in a clearance will be between +/- .0001”, choice of two compression ratios: 9.5:1 the main bearing clearances will be beor 11:1. The connecting rods are made tween +/- .0002”, and the rod bearing by Manley in a stock length forged Hbeam design.
Livernois: Made In Detroit
Circle 72 for more information 54 March 2013 | EngineBuilder
Livernois Motorsports of Detroit has been very active in late model performance for around 15 years but its real history goes back much further. Originally started in 1949 as Livernois Engineering, the shop designed aluminum radiators for automotive use. In addition to designing radiators, they also produced the tooling and machines to make the radiators. Their facility is located on Livernois Avenue in Detroit, Michigan. In 1999, Livernois Motorsports was created to develop products for high end demands of automotive enthusiasts. Livernois Motorsports now develops and tests new products along with adding product lines from hundreds of vendors to provide the latest technology. In addition to developing, testing, and retailing, Livernois is a supplier to GM, Ford, and Chrysler through the OEM level and the performance parts business. ■