[jim_howard_pdx]

First of all, LOSE the fluid dampner balancer. This is not a good piece for a drag race engine. At steady rpms, the inner ring will balance within the silicone. For an engine that is screaming through an rpm range, it will smooth some parts of the range, and make others WORSE. Wanna spin a bearing? Wanna break a crank? Go with a ROMEC or with an ATI balancer.

Second, why do you want a turbo charged engine? You are going to cook the inside of the engine bay. So if you are not road racing, or going for a bonneville record you should be looking at a centrifugal supercharger like a Paxton or a Velodyne unit. These are awesome units.

I built a twin turbo charged 350 small block chevy engine once. It was slow as hell to 100. Then ran 100-150 mph like a DEMON. It could not come close to beating a turbo porsche, so I sold it to a kid that wanted a twin turbo engine. By the way, just the dual waste gates for that engine cost me 750 bucks back in the 80's. Just imagine what it will cost to build a safe dual turbo today.

Personally, I would go with a great fuel injection engine like a modern 302 with MAS fuel injection and the roller lifter cams. With a fogger NOS system you can run 11 second times without a problem. This will beat a turbo porsche. Plus, the car will be sedate without being bottle fed. It will be a nice ride.

Most importantly, you can be creative. You can build a 347 stroker, with solid lifter roller cam and AR or Trick Flow heads and get a solid 600 hp with NOS and a solid 500 hp on the engine. You can expect 15 mpg if you don't go overboard on rear end gears. I would go 3.70 to 4.10 if you want to quarter mile, and go 3.50 if you want to autocross.

You can do this without the heat and damage done by turbocharging. Really, I HATE TURBOS because of what they do to the engine bay. They are a big hair dryer.

Don't take me wrong, they are the way to go if you want to go faster than 190 mph. But really, turbos are for road racing and super chargers are for off the line. NOS is for those that want a great car with power on demand.