Hi all - just got my hands on a fantastic H2. i want to do an engine swap. Can someone direct me where to buy an engine? Also can I put a 6.2 Ltr in or do I have to stick with a 6.0. Anyone know approx costs? Thanks

 

Considering that the full size GM trucks and SUV's are far far more common and use the exact same engines you would probably find more info on one of the many GM truck or SUV enthusiast forums. I doubt many active members on here have swapped their engine but I know at least one or two have. The 08/09 models (that came with the 6.2) have a totally different electrical system but I'm sure there is probably a way to swap to a 6.2 but you might have to retain the 6.0 accessories (water pump, brackets for alternator, coils, etc). Might be able to modify some aspects to work but again, I'm certain many others on the much more common truck boards have done or tried it. I know there are some variations in the newer engines with things like AFM (active fuel management), DOD (displacement on demand), FF (flex fuel), VCP (variable cam phasing), and VVT (variable valve timing). I'd imagine any engine with those components would need additional electronics to work properly but maybe it is possible that those newer things could be removed or in some way disabled. A complete LS9 or LSA swap would certainly be fun but I'm just not sure what might be required electrically. I think most wanting more power without spending 10's of thousands just do a nice 6,0 build with some higher performance components like a cam, heads, etc as that can just bolt and plug right in (a custom PCM tune would be massively beneficial). There is also now the newest big gas Vortec, the L8T which has been pumped up to 6.6.

One of the biggest gotchta's for increases in power (as well as going with larger tires) is the 4l65e transmission is not going to withstand much in the way of additional power. So a very well built transmission will also end up being needed - contrary to popular belief, with the right components, a 4L65e transmission can be rebuilt to easily handle upwards of 600hp. Others look at a 4l80e swap which is also doable but adds quite a bit of additional complexity with the needed custom work to make it fit and work (and the 4l80e also has much different shift points).

 

Anything is possible but you will need to address the electronics. Read about it here: https://www.lsxmag.com/news/engine-s...-of-a-gen-iii/

You will also be going from an iron block to aluminum block and a 6.2 might be a little hard on the 4l60e transmission necessitating a transmission swap to a 4l80e which is another can or worms.

I've been pondering something for mine too but have all but decided to just get another 6.0 block and put together a mild stroker.

Tim

 

08-09 6.2 models came with a 6 speed transmission not the 4 speed that the 03 has. i believe the 6.0 can be bored over to a 6.2.

 

THE POWER OF A DURAMAX H2 HUMMER

 

I'd be interested in what your choice will be. My 07 has a lower mile (105,000) 6.0 which is the base LQ4 chevy engine. There is also the 6.0L LQ9 which is around 400HP, stock for some of the 2500 series trucks. Not sure if the LQ9 would be a plug and play with our ECM's even though they were manufactured for our years.

Otherwise a mild build with a low to medium end more aggressive cam and perhaps higher compression would bring our LQ4's alive.