H3 L5 Rebuilt Stock or Performance?

[USMC_TOP]

Found this: Any of you needing a new engine or wanting to keep your L5 sounds like these guys can build it to really run? I know some of you are are at the rebuild or replace point with your rig. I know we all want more from these in line 5's, I'm curious to what they have to offer performance wise building one to perform.


http://www.hiperformer.com/engines/hummer-h3-used_engines-x_704.html

 

[CaseyS]

That just looks like a bulk engine rebuilder. They won't have any magic bullets that you can't find elsewhere on the internet for bolt-on power adders. If you are at the point of needing an engine rebuild, I would lean toward rebuilding the block you have with a local reputable shop. Unless of course you managed to put a con-rod through the side of it, but with the power levels on the I-5, would be hard to do.

 

[digglesworth]

My plan is to find a rebuilt 3.7 when it's time to junk my 3.5... But I only have 86k miles so it may be a little while.

 

[CaseyS]

No expert here, but in an 06, won't it be easier to just bore the 3.5 and install 3.7 pistons during a rebuild? Or will the 06 PCM play OK with a complete 07-10 3.7?

 

[atvspeed4]

No expert here, but in an 06, won't it be easier to just bore the 3.5 and install 3.7 pistons during a rebuild? Or will the 06 PCM play OK with a complete 07-10 3.7?

Its just about plug and play to put a 2007 3.7 into a 2006. The 2007 3.7 is the only year this is easy to do with unfortunately.

 

[digglesworth]

I'm not sure. I believe only the 07 3.7 motor will fit in the 06... Not sure about the pcm either. I figured I'd just send it to pcmofnc and have them reflash it for the 3.7.... If they could just rebuild my 3.5 as a 3.7 and use everything that's already on it, that would work out awesome. I just want the extra 24hp the 3.7 has.... I'm kinda clueless on this...

 

[digglesworth]

Its just about plug and play to put a 2007 3.7 into a 2006. The 2007 3.7 is the only year this is easy to do with unfortunately.

Do all the accessories from my 06 3.5 bolt on to the 07 3.7? Alternator, AC, Intake and TB?

 

[USMC_TOP]

That's what they say, the 07 is the only year that is a good fit. I want to know if they make performance engine components for a 3.5 or a 3.7? Higher compression pistons? Does porting help these newer engines? Is the block cast iron or alum? Does someone make an aftermarket performance head? Can the block be bored out? These are the things I would like to know about the inline 5. Maybe someone out there has the answers? It would be nice if we could get 300 hp out of the 5........

 

[rsc]

I don't think you can bore them out any bigger, they look pretty close already.