"Coming off his Class 3100 victory at the `SCORE Baja 1000', in November, Team owner Rod Hall is anxious to get back behind the wheel after a three month layoff from competition. The #3111 H3 SUV went back to the Desert Proving Ground after the `Baja 1000' and received a new, more powerful engine, adding about 40 horsepower to the Vortec 3500 powerplant. The wizards from Fox Shox have come up with a new configuration for the shocks which has improved the handling even better then it had been. With Rod Hall at the wheel, a more powerful Vortec engine and the improved handling provided by Fox Shox, the Team HUMMER H3 will be a hard truck to beat at the `Parker 425'."
Team Hummer Parker 425 preview

"Coming off his Class 3100 victory at the `SCORE Baja 1000', in November, Team owner Rod Hall is anxious to get back behind the wheel after a three month layoff from competition. The #3111 H3 SUV went back to the Desert Proving Ground after the `Baja 1000' and received a new, more powerful engine, adding about 40 horsepower to the Vortec 3500 powerplant. The wizards from Fox Shox have come up with a new configuration for the shocks which has improved the handling even better then it had been. With Rod Hall at the wheel, a more powerful Vortec engine and the improved handling provided by Fox Shox, the Team HUMMER H3 will be a hard truck to beat at the `Parker 425'."
Team Hummer Parker 425 preview

i want to know what he's doing to the power plant

It is obvious from the quote that it is a new power plant that is making it's debut. Not a modification to the old 3.5 I5.

Yeah, but the question is where is the power band located. at what rpm range?

At first I thought the article might be incorrect and the engine is not the 3.5L I-5. However, the gain of 40 hp versus the 25-30 hp for the '07 engine has me baffled.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Team Hummer Parker 425 preview </div></BLOCKQUOTE>
I will be there (in Parker AZ.) for this event. Looking forward to it.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by hmrlvr:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Team Hummer Parker 425 preview </div></BLOCKQUOTE>
I will be there (in Parker AZ.) for this event. Looking forward to it. </div></BLOCKQUOTE>

Tell Chad I said HI!!

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by f5fstop:
At first I thought the article might be incorrect and the engine is not the 3.5L I-5. However, the gain of 40 hp versus the 25-30 hp for the '07 engine has me baffled. </div></BLOCKQUOTE>

Could easily be the 3.7 with An Air intake and exhaust.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by HoKC:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by f5fstop:
At first I thought the article might be incorrect and the engine is not the 3.5L I-5. However, the gain of 40 hp versus the 25-30 hp for the '07 engine has me baffled. </div></BLOCKQUOTE>

Could easily be the 3.7 with An Air intake and exhaust. </div></BLOCKQUOTE>

Probably correct. Then again, they have this modified at GM's desert proving grounds. No telling what those guys did to it out there.

All they did was add one of these.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by PARAGON:
All they did was add one of these.

</div></BLOCKQUOTE>