diffrent GM turbo's?

[Cruzer]

Ok i have been looking around at turbo's breifly to swap onto my 6.2L and i am seeing GM-3, Gm-4, GM-5 ect what are the diffrences in the turbo setups? I have a line on a GM-3 and GM-4 but don't really have a clue what the diffrence is. Thanks.

Stew

[racecitymike]

Somebody please....Although I consider myself quite knoledgable in the 6.2 and 6.5 field, this is always a question I have wondered and would love some insight. I mean obviously there from different applications, but whats the real differences? Turbine wheel size? input output size? Input output location? Etc Etc

[jac6695]

Basically, the numbers reflect the various models through the years, and got better later in the production of the 6.5.

From a reputable source at another 'Place:

GM-4 used '94-'95

GM-5 used '96-'97

GM-8 used '98 to present is the best and most efficient of all the GM-series turbos

GM-5 is -8 equiv, but with shorter wastegate bushing, which wore out quickly.

Use the -8 exhaust elbow on a -5, and you have a GM-8