I'm building an LT1 and want to use either a roots style blower or a turbo. I'm looking for pros and cons of each from people using each. Here is what I have so far...
4 bolt main block that has been acid dipped, decked bored .030 over and CNC cleared for 6" rods. Crank is forged with a 3.875 stroke which I believe makes it around a 395ci.

Heads are off a corvette that have been surfaced, hard seated, ported and polished with a 52 or 53cc chamber (dont remember) with a set of 1.6 rockers.

Cam is a comp XFI with specs of
Rpm range 1800-5800. Valve lift int/exh. .570/.565
Lobe sep. 113 degrees. Duration @.050 218/224

I have never added a blower or turbo to anything so be gentle with the comments. Thanks in advance for help

 

Which year LT1 are you working with, and what model & year car are you trying to put this engine in?

 

The block is a 95 and I'm not sure on the heads. It's going in a 94 Z28

 

Anyone have any info to help me out? I would like to get one or the other soon

 

The easiest would be to add a centrifugal supercharger because it fits without body work. The roots blower is going to be cramped for space under the cowl. The turbo set up involves a lot of fabrication. The 4th gen cars are very cramped for space in the engine compartment, and the engine is stuffed part way under the windshield.
Take a good look under the hood before you decide.

 

Any big power differences between the two? One have more torque or hp over the other?

 

Generally the centrifugal and turbos favor the high end and are while the roots blowers favor the low end. Centrifugals, because they are larger and belt driven do not suffer the lag that turbos do, but do not exhibit the low end punch of the roots. However, there is always the exception, like the modern Eaton blowers used on many new cars.

 

Sounds like a centrifugal is the way I should go. I'm looking to put my brothers STI to shame. Dang all wheel drive takes me off the line everytime but after this motor and blower are done comes the street drag tires and bye bye suby. Thanks for the help

 

After you add a supercharger and street radials, you will need to get a supply of new rear ends, unless you change the one you have to something stronger.

 

I have already have the rear end at a shop getting built including a set of 4.11's. Only thing Ill have left will be the trans which hopefully won't be far down the road