how about a stock LT1 crate motor and an ATI P600? this seems so simple there must be a catch--

 

What? Whats the hp/tq?

 

Sooner then later the stock internals will be toast!
You also need a cam and heads for that extra boost!

 

from what i read the ATI P600 is designed for only 7-8 lb of boost--they make a step up that goes 0-15 or 16---the P600 is designed for a stock LT1 with NO MODS and is supposed to boost
120-140 hp at higher rpms--i need to talk with someone who has actually done this to see if the low-boost unit will cook my innards--it' s an intercooled design and is pretty expensive--the book(camaro bolt-on performance guide by john smith) talks about a 55% boost in hp AND torque--420 bhp @ 7 psi--

 

ATI has some good stuff.

But you'll get the same horsepower with a set of good heads and cam... you'll be alittle lower on the torque but your internals are not meant for boost. My moderate heads and cam got 150 hp out of my car.

 

a buddy told me heads and cam would only get me about 60 hp--i don' t want to go too wild on the cam and 400 hp is my goal, give or take--what do you suggest? (i' m getting a stock LT1 carte motor)

 

Why waste your money on a create motor when you can just get a set of heads and a cam for the same price and run the same amount of hp as a stock motor and a blower. You have to run low boost on a stock lt1 or you will blow the internals away. Also the stock cam will not handle any extra boost, it was not designed to handle a blower for any length of time. With all the money will spend for a create motor and blower a set of heads and cam will easily out run that combination. It just doesn’t make an sense to do what you want.

 

I picked up around 100 hp with my heads cam combo. There is more HP in my combo my cam is pretty mild and I am only running shorty headers. You can easily get 120 out of a heads cam combo. Your internals will not last for ever under boost. I have read that the ring lands will give out and then it is rebuild time. JMHO but you can't beat the sound of a good cam.

 

how about you do the heads and cam first, decide if you like it, then do a blower, you will get MUCH more power doing the whole combination.

If you have to smog, then stick with the blower, its legal

 

I have picked up about 100 rwhp w/ my Cam only LT1. I haven't even touched the heads, and I have a medium sized cam. And on top of that, 3" true duals are coming soon as well. Look at my sig for all mly other mods.

But my advice would to go cam and long tubes along w/ all the other bolt ons if you want 400 flywheel hp. If you want 400 rwhp, then go w/ heads and the Comp Cam 306 (or GM 847) cam and all the other bolt ons.

 

well, your cam numbers, if you decide to go this route, is really a hit or miss if you just throw whatever cam in
if you want to do it right, get heads and measure the flow #'s and get a custom cam just intended for that setup
that's the difference between the guys who are sub-400 hp and the guys who are 400+

 

gentlemen i appreciate the great response--i' m going crate because the z was may dad' s and has 160k on it and i don' t want to start building an old motor--and the rebuilder i talked with needed the car for eight weeks--my goal is 400 hp and i couldn' t get a crate motor @ 400 hp--that' s why i started thinking centrifugal blower--just now somebody told me about golen engines--they offer 383' s at 400 and 480hp--are they remans? what sort of rep do they have? if that' s a bored block aren' t the cyl walls kinda thin? thanks beck

 

Generally a seasoned block will be a little better than a brand new motor. All the rough spots will have been worn down and any flaws will have already shown themselves. Your best bet would be a heads and cam package as everyone else has mentioned. A blower will give you a kick in the pants, but it's not a simple undertaking (you don't just strap it on and go like the manufacturer says, trust me on that one). Some people see thousands of miles on the stock internals, some people see tens of miles. If you want a good crate engine, try calling Combination Motorsports (www.cmotorsports.com) and talk to Brian or Seth, I've heard they build a really good product, and their customer service is top notch.

BTW, building a 355 or 383 from a used block won't hurt the cylinder walls much. Those motors are generally 30 over which is well within tolerances of what the block can handle.