I just yesterday received my H1 ’94 Truck back with the slant back accessory.
I am already forward thinking about swaping the OEM 6.5 for a Duramax 6.6 (turbo). may question/s: Which variation would be the BEST choice, also am wanting to add a 2nd fuel cell on the “portside (drivers) to boost current capacity from 25 gals. to 50gals total.
I welcome all experenced input to both endeavors.
Thanks for your ideas

 

My 94 had the stock later model tank added for a capacity of 42.5 gallons. Lot of Duramax conversion horror stories. To do it right you need to do a 2" lift, new hub gears, brakes, half shafts, frame rails, etc. it is a lot more involved than many think. Make sure you go to a reputable shop if you have it done.

 

Ok perhaps my enthusiasim is a bit far fetchted.. Where might i be able to obtain that 50gal. fuel cell?? and would you advise a turbo conversion? along with a performance chip/computer.??
Many thanks for your input...
Rob

 

Excuse me there, I ment the 42gal. fuel cell.

 

Hummer Parts Guy | Genuine Hummer H1 Parts and Accessories. Dave can help you out. The 6.5 is not a motor that yields big performance gains. My 6.5 TD gives me 10-12 mph more top end and a little faster acceleration over the 6.5 NA motor. How much is that worth to you? My 6.2 NA like to cruise at about 55-57 mph. The 6.5 NA will cruise at 65 mph and the 6.5 TD likes 65-70 but will cruise along at 75 on flat highway.

 

is any or much modification required or needed to swap to the “td code”?
Again thanks

 

Mine was already done so not sure. Seems like you need some additional height clearance.