Thread: Specs for 350 for a 1990 policepak

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I have a Chevy police pack with a 350 and i'm trying to find on the net the specs for that car: hp, torque, etc.

I have one of those for sale (i just want the diff and stab bars) but someone is trying to persuade me of buildind that motor, instead od the 305 that i already have in my car.

I just want to build a daily driver with some muscle, not a drag engine.

Thanks guys!

I found this http://www.9c1.com/brochures/ unfortunatly it starts off in 1991. But might be helpfull?

I looked but I can't find anything, use Hotrod59's site and read the '91 PDF. I know it's around 300 horse stock, probably more.

In the pdf, they talk about a LO5 that pumps out 195hp and 200 something of torque...

Isn't a LO5 a 305?

Maybe they changed motors that year...

Maby, but it dosen't seem like they used 305's in cop cars, maby they did. For a shure test of the PI ( Police Interceptor ) engine your getting, b4 you take the car apart, take it for a spin and see how it performes. If it is a 350, it should have duel exzaust, if it dosn't, that's not a dead givaway it's a 305 as they don't put duels on all 350's, but if it does have a stock duel exzaust, dead givaway it's got a 350. Look at the 1989 PDF to see if it has a diffrent number. I would check but I don't have Adobe reader right now, I have to find my disc.

Dont confuse the police package with performance...... the engine mods were mainly oriented towards longevity..... in both the 5.0 and the 5.7, there were items like longer life rocker arms, etc.

Neither motor was much in a loaded cop car...... 5000 lbs of stuff with an air deflector mounted on the roof.

Originally posted by robot
Dont confuse the police package with performance...... the engine mods were mainly oriented towards longevity..... in both the 5.0 and the 5.7, there were items like longer life rocker arms, etc.

Neither motor was much in a loaded cop car...... 5000 lbs of stuff with an air deflector mounted on the roof.

Still, ither 1 of the cop engines are better than a '83 305 which is likely rated at 125 horse, he's got to get the car for the diff/stab bars NEway. I know my teacher has a '96 Caprice Police car with an LT1 350 and it is rated higher than the regular production engine, but that's an LT1 not a regular 350.

Thanks for your help guys!

I'll keep looking on the net...maybe directly at the manufacturer.

My car should get back from the paint shop next week and i also have a small area of the frame that needs to be changed.

After that, i'll change the suspension, diff, exhaust sys and then the motor (whatever will go in).

At first, i was looking for the ram air version of the firebird (around 99-00) but those motors are extremely hard to find!!

It would of bolted right in; too bad!

I'll try to put pics pretty soon.

Originally posted by Matt167
... I know my teacher has a '96 Caprice Police car with an LT1 350 and it is rated higher than the regular production engine, but that's an LT1 not a regular 350.

Answering the original question, the 1990 engines in the Caprice 9C1 (the name for the police package) are either the LO3 (5.0 liter, or 305 cid, vin engine code E) or the LO5 (5.7 liter, 350 cid, VIN engine code 7). Both are TBI, and the power ratings would be 170 fwhp for the 5.0 (*exact* same engine as the non-police Caprice) or 190 fwhp for the 5.7. Note that the 190 fwhp 5.7 was ONLY offered on police vehicles (like the 9C1) during 1989-1990. The power jumped to 195 fwhp in 1991, and then 205 fwhp in 1992-1993 ----- but only for the 9C1 application. The cam used was taken from the L98 Corvette engine, and the engine had larger fuel injectors and a revised ECM tuning to suit the need for more air+fuel.

The non-police version, 180 fwhp, of the 5.7 became available in 1991 in Buicks Roadmaster and Olds Custom Cruiser wagon, and then later on the Caprice LTZ in 1993. These engines used the cam from the 305 and had more restrictive exhausts.

For Matt167: your teacher's car, if it had either the 4.3 liter v8 L99 engine or the 5.7 liter v8 LT1 (both were available in the 9C1 from 1994-1996) would be IDENTICAL in every aspect to the engine offered in the non-police Caprice (or even Impala SS). It is not rated higher. The LT1 was 260 fwhp and 330 fw ftlbs in all B/D platform cars and wagons. The Fcar and Ycar versions of the LT1 were rated higher in hp output because they used warmer cams.

Ed Sanow's book "Chevrolet Police Cars 1955-1996" has all the info in it; you can also find the car/engine info on the various Impala SS and 9C1 websites because the owners of them post Q and A all the time, and the true answers are shown along with the hearsay..... so you can read and see for yourself. I owned a 1994 LT1 9C1 and it was no faster than an Impala SS, and slightly quicker than the non-9C1 LT1 Caprice only because I had a 3.08 rear end (factory std on the LT1 9C1) and the non-police version got the 2.93 or 2.56.

If your teacher thinks he has a hotter engine, he is mis-informed. Chevy's own 9C1 literature confirms what I posted above, and the tests done by the Michigan State Police for the 1994-1996 model years confirm the engine output, based on the vehicle weight and the acceleration & top speeds. The MSP info is also online at

http://nlectc.org

http://www.nlectc.org/virlib/default.asp

http://www.nlectc.org/virlib/TopicLi...?intTopicID=51

Online 9C1 info is here:

http://www.9c1.com/

and the 1989 specs (via brochure) are here --- and 1989 will be the same as 1990 as far as the engine is concerned:

http://www.9c1.com/brochures/index.html

HTH.

Originally posted by Parisienne305
In the pdf, they talk about a LO5 that pumps out 195hp and 200 something of torque...

Isn't a LO5 a 305?

Maybe they changed motors that year...

crate engines depot .com shows a 92-93 chevy/buick 350 (LO5) by Goodwrench so I'm still not sure what a (LO5) is ? al

Originally posted by al tillman
crate engines depot .com shows a 92-93 chevy/buick 350 (LO5) by Goodwrench so I'm still not sure what a (LO5) is ?

LO5 is either :

A. a 5.7 liter (350 cid) hydraulic roller cam v8 from 1989-1993 police (9C1) Caprice, 190 to 205 fwhp depending on model year. Uses L98 cam from the Fcar;

or

B. a 5.7 liter (350 cid) hydraulic roller cam v8 from 1991-1993 passenger car (non-police) Olds Custom Cruiser wagon (1991-1992), Buick Roadmaster sedan and wagon 1991-1993, and Caprice LTZ (1993); all 180 fwhp. Uses same cam as LO3 5.0 liter (305 cid) engine. This one is the Goodwrench engine you mentioned;

or

C. a 5.7 liter (350 cid) hydraulic flat tappet cam v8. 19??-1995 light trucks, up to 210 fwhp depending on model year.

IIRC all use the swirl intake port head, either 191 or 193 suffix in the casting number.

I have a 1989 9C1 Police Caprice, and my main question is always: how to make it go faster and perform better. How fast is it? Well, not fast enough.

Here is what I have done: Rebuilt 700R4 trans, billet servo, shift kit.
Performance Distributor's cap, rotor, module, wires, platinum plugs.
Mobil 1 Syntec extended life oil. K&N oil filter, K&N air filter, and K&N chrome filter lid from Summit Racing. A Flow Cooler hi-perf water pump, also from Summit. Hotchkis springs dropped the stance down about 1.5" and Bilstein shocks. Also a complete Performance Suspension Technology front end kit and performance rear brake (drums) kit. I need to replace the tires, and I am considering a set of Yokohama Avid ST. P225 x 70 in front, and P255 x 70 in the rear. Rear tires, slightly wider and taller. I also have a Hypertech chip which I will install after I get the new tires. All you fellow gear-heads, any more ideas? I live in Illinois, and this car MUST pass their tough emissions test/scam every two years... I am building the car for performance, and better milage. The original style exhaust is still on the car, and I would like to get street legal headers ceramic coated wtih AIR and Oxygen sensors, a Random Technologies high-flow Catalytic Converter, and some type of dual exhaust set-up. Most realistically a Flow-Master one in two-out set up like I have seen on line for Firebirds and Camaros. Does anybody out there have any experience with this type of vehicle, and or set-up. So far I have built this car on a budget. I don't make a lot of dough, and money is always a factor. If you have ever owned or driven one of these vehicles, you know they are one of Chevy's greatest, but I know there is still a lot of untapped potential there still... Thanks. JC

Originally Posted by JohnChicago

... Here is what I have done: Rebuilt 700R4 trans, billet servo, shift kit.
Performance Distributor's cap, rotor, module, wires, platinum plugs.
Mobil 1 Syntec extended life oil. K&N oil filter, K&N air filter, and K&N chrome filter lid from Summit Racing. A Flow Cooler hi-perf water pump, also from Summit. ... I also have a Hypertech chip which I will install after I get the new tires. All you fellow gear-heads, any more ideas? I live in Illinois, and this car MUST pass their tough emissions test/scam every two years... I am building the car for performance, and better milage. The original style exhaust is still on the car, and I would like to get street legal headers ceramic coated wtih AIR and Oxygen sensors, a Random Technologies high-flow Catalytic Converter, and some type of dual exhaust set-up.

OK there is no question that you could get the car running as fast/quick as the still-emissions-legal people with 94/96-era LT1 Caprice 9C1s. But you'll have to do this sensibly.

1. You could either add the 92-93 big Ypipe 9C1 exhaust, with a 3" pipe aft + aftermarket muffler (the easier choice), or opt for the better but more difficult choice: full N10 dual exhaust install from a 94-96 LT1 car. I won't detail that swap here. Instead go here and start reading:

http://impalassforum.com/noncgi/ulti...;f=33;t=009021

It applies to 91-93 TBI Bcars, but the 89-90 are basically the same so it works for you as well.

2. Don't use that chip. Read the aboove link and you will see why. I'll come back to the chip in a moment.

3. Open element air cleaners have very little flow restriction, and they are quite loud and sound powerful, but they are also not as good as an cold-air intake + filter... because ingesting pre-heated underhood air robs the engine of power. With your brick Caprice, you should be able to fit a truck TBI air cleaner lid onto yours that will allow a taller factory filter (more cross sectional area) AND allow you to adapt it for dual snout air feeds, much like the HO air cleaner used on the 3rd gen Camaros. Feed the dual snouts with flex hose to the front of the car, to source good cold air.

4. I think you probably already have a decent roller cam in your engine.... IIRC it's the same as used on the L98 TPI engines. But it could use more lift, so the $75 set of 1.6 stamped self-aligning rockers would be cheap and useful to gain more lift/flow with that cam.

5. The above will all help but it's small gains... perhaps 20-25 hp better than your stock 190 fwhp rating. To get more you need to port the heads for bettter flow, and you need a custom-tuned chip to suit the engine mods.

I'll say more later. Gotta go.

I'll say a few more things. You can always get more power by adding a hotter camshaft, like the GM LT4 HOTCAM.... but it will require extensive ECM retuning and you won't get the full gain from the cam because of the stock heads.

The stock heads are fast burn (which is good) but they also don't flow air very well. Porting them will solve that problem. Reading up on them before porting is a good idea too:

http://www.thirdgen.org/techboard/tb...-headflow.html

They can be ported such that they can flow much better that stock up to the point where they can equal the flow and probably have a better burn than the L31 Vortec heads.

You could also buy a set of L31 Vortec heads + an appropriate intake manifold (either carb intake + adaptor for your TBI unit, or a new Vortec/TBI intake) which would cost a lot more $$ but sidetep the head porting. Keeping your stock cam, and adding a good exhaust you would be looking at a solid 300 fwhp and a car that would run low 14s in the quarter mile. If you swapped in a bigger cam you'd be in the 13s.

The final thing to say is that any way you choose to add power, especially beyond the cheap/easy cold-air-intake & exhaust mod, that you will need a new chip (EPROM) to properly supply the right amount of fuel at all loads and speeds. I won't explain this anymore other than providing some useful links, and to say that TBI is a speed-density type of fuel injection so it relies on precomputed tables for load, rpm, and fuel. There are several places that can help with a custom chip, but you won't get as good a result than if you spent the money to buy the programming tools and do it yourself.

http://www.thirdgen.org/techboard/tb...free-tune.html

http://www.thirdgen.org/techboard/diy-prom/

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