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When I enter any of these part/customer numbers at the holset website nothing comes up. Can anyone help me identify this turbo????!!!

 

H1C common on many Cummins. The best way to know more is to pull the housings, and measure the wheels, it'll give you a good idea of what potential it has, but they're typically sub 60mm compressors, and close to a p trim Garrett turbine wheel.

 

I have a few of these, my old man used to be a diesel mechanic on bread trucks. I have a pontiac 326 i was thinking of throwing one or two of these on. Would these turbos work for something like that or on an ls? What could I expect to gain hp wise with one?

 

On the 326 one may be a bit small, but usable, two is too much turbo for a stock 326 imo. Two on a ls may work, but the turbine housings are typically large a/r wise, so there again probably not the best fit.

 

How many # of boost can I expect to make on that one small turbo? What can I expect in hp gains, rough estimate?

 

It'll make plenty of boost on the 326, but with a small turbo, at some point more boost doesn't make any more hp, and is just hard on parts. How much it will support on your engine is tough to say. If you know how much your 326 makes na, and look at a compressor map for the h1c it'll give you a good idea of where you're at. Theoretically at ~15psi you can double your hp, but I doubt you'll do that on your 326 unless it's anemic in na form. If the 326 makes less than say 200hp na then it's probably not a real bad fit, and it'll work much better than if it makes 225-250 na.

 

Thanks for the advice

 

The turbine is probably pretty decently sized for a 326, but if it's big they make a few other housing sizes too. There were a few variants of the Cummins turbo made, and you may find that you have some because it was done by year on the Dodges anyways. A stockish to mild cam 326 should work out well. Something else worth keeping in mind is you can buy an H1E compressor and housing and they'll bolt on to make a hybrid; A diesel performance place probably sells them.