Difference in 05' & 06' engines ? 275hp vs. 291hp.

[HoganRadial]

Hello guys, any idea what was changed in the 2006 4200 to get the extra 16 horsepower ?

Love my 05 Trailblazer, and looking forward to posting alot here, as I have several interesting questions/topics.

[Alfb]

Found this on the Isuzu site:

Both Ascender models come standard with the acclaimed Vortec 4200 inline six-cylinder engine, named by Ward's AutoWorld magazine as one of the industry's "10 Best Engines" for the last four years in a row. For 2006, this 4.2-liter powerplant generates 291 horsepower-a 16-horsepower boost. The engine's torque output has also increased from 275 foot-pounds at 3,600 rpm to 277 foot-pounds at 4,800 rpm.

This significant improvement in power output was accomplished by extensive changes to both the engine's block and head-including revised rod casting and machining, rod squirters and bearings, wrist pins, piston casting, crankshaft cross-drilling, valves, valve seats and springs, cylinder head machining, camshaft covers and ignition coils.

Hope it helps.

[HoganRadial]

Thanks, I was hoping is was just an updated ECM, and that I could pick one up late next year out of a wrecked 06, for a cheap 16 hp "upgrade"

thanks again, for the quick reply.

[tblazed]

Follow this link to post #7 about the changes made to the 2006 ...

http://forums.trailvoy.com/showthread.php?p=32989#post32989