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TheGunnyRet -> RE: Question on '06 - '07 H3's... (11/28/2007 4:29:52 AM)
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For interior changes it was done on the 2007 1/2 rear models, Moved the buttons forward on the left door, supposedly the Brake and Gas pedal had been moved more slightly apart, Don't know about the DTRL.
Engine Changes:
2007 Vortec 3.7L I5 VVT (LLR)
2007 model year summary
• Increased displacement and power output
• Larger intake valves
• Larger exhaust valves
• Valve lift and duration optimized
• Cylinder head intake and exhaust flow increase
• Larger close-coupled catalytic converter
• Increased PCM memory for new diagnostic requirements
• Meets new BIN 5 emission requirements
• Aluminum cam cover for reduced noise
• Sophisticated noise-reducing oiling system
• Tighter clearance balance shaft bushings
• A.I.R. system added to reduce emissions
• New cartridge block heater
FULL DESCRIPTIONS OF NEW OR CHANGED FEATURES
INCREASED DISPLACEMENT AND POWER OUTPUT
To increase displacement from 3.5 liters to 3.7 liters, the bore was enlarged from 93.0 mm to 95.5 mm. The increased displacement contributes to an increase in both horsepower and torque (see specifications). The compression ratio remains an efficiently high 10.0:1.
LARGER INTAKE VALVES
To optimize the greater volume of intake charge allowed by the increased displacement, the intake valves for each cylinder have been increased in diameter from 37 mm to 38.7 mm.
LARGER EXHAUST VALVES
To allow better flow of exhaust, the exhaust valves have been enlarged from 30.5 mm to 33.5 mm.
VALVE LIFT AND DURATION OPTIMIZED
Camshaft lobe profiles have been changed to optimize the lift and open/closed duration of the larger intake and exhaust valves for best efficiency and performance.
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