The news for the 2005 Pontiac GTO was good. Pontiac, which could have just taken a break and enjoyed another year of GTO success decided to up the ante. The reason behind the GTO - the engine - was improved significantly. The 2005 C6 Corvette was assigned a new engine (with a new designation: LS2) and the Pontiac GTO inherited all the upgrades. Engine displacement went from 5.7 liters (5665 cc. / 346 cu. in.) to 6.0 liters (5970 cc. / 364 cu. in.). Horsepower went from 350 hp to 400 hp. A list of other improvements included:
Camshaft lift increased to take advantage of increased cylinder head flow
Engine redline raised to 6500 rpm (2004 LS1 engine went to 6000 rpm)
Camshaft sensor relocated from the rear of the block to the front of the block provides room for new oil galleries
Flat-top piston design with lower ring tension which reduced friction
More efficient ignition coils requiring less energy to provide a comparable spark
Compression raised to 10.9:1
Larger, 90-mm single-blade throttle body
Reduced-mass water pump design with improved sealing capability
New aluminum block casting with revised oil galleries and provisions for external knock sensors - external sensors improve serviceability
Revised and more powerful engine controller incorporates all electronic throttle control functions.
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