Well my z28 only has the 305 TPI (auto) in it. Damn good engine, has 130,000 miles and running good for how many miles are on it. BUT its not putting out the power I would like it to have. I've researched the 350 ZZ4 for the last several months and decided that its a good engine for my car.

My question is kinda vage... I have NO mechanic knowledge (except the normal oil change and tunups).
How would the computer act if I put this 350 in it? Would I still beable to use the TPI intake like I want (will it fit)? Can I get away with using the stock tranny until I can replace it at a later time?

I guess I just wanna know all the details before investing just over 4k into this engine. I'd like to swap it out myself.

[This message has been edited by TRU (edited June 16, 2002).]

 

If you have the extra money get the ramjet.A true bolt in.The stock tpi set up will be to restrictive.

 

He just said that he has researched the ZZ4 for several months and I imagine that's probably what he's going with... (good choice by the way!). Yeah you should be able to use your TPI intake. I can't confirm whether your tranny will directly bolt up or not though. If I were you I'd keep the TPI and port the heck out of it .

http://sethirdgen.org/TPIbase.htm

How to port your TPI for maximum potential ^^^

 

The L98 heads on that ZZ4 engine have the 86 and older intake bolt pattern, so you'll want either an aftermarket intake manifold, or you'll have to elongate the middle four holes on your stock manifold. Also, those heads dont have EGR, so if you must pass smog you'll have to fabricate the EGR tube like a Corvette. Lastly, those heads are missing one bolt hole for the serpentine accessory setup, so you'll have to drill and tap the hole on the passenger head.

Here's my pics of the EGR setup and engine install:
http://para.noid.org/~thresher/image...1&dispsize=800


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1991 Camaro Z28
350 L98 w/ T56 (originally 305 LB9 w/ T5)
318 RWHP, 419 RWTQ
12.803 @ 108.50 MPH (1.932 60')
Member: SoCal F-Bodies
ThirdGen 4-Life!

 

In addition to the intake manifold issue raised above you also have to take into account the 50 extra cubes (tuning).

What you need to do will depend on what type of TPI setup you have..... Ultimately, you will need bigger fuel injectors (I'd recommend 24# injectors to replace your stock 19# units) and a custom burned chip to make it run it's best. But, just to get it up and running you can get by for a while doing one of the following:

If you've got a Mass Airflow Meter type TPI setup then it will automatically compensate to a great extent for the bigger engine. In other words, bolt it on and turn the key. Since it's got a MAF meter it will know that there is extra air going in the motor and add the extra fuel to compensate. You will have the little stock 19# injectors pretty well maxed out at WOT so don't go beating on it like this until you get the bigger injectors AND the chip, but it will run and drive acceptably. Don't ever change injectors on a MAF-type FI system without also getting the chip programmed to work with them- they are calibrated to work with eachother and don't take kindy to injector/chip mismatches.

If it's a later style Speed Density system on the other hand (no MAF meter) then you will want to install the bigger injectors at the time you put in the bigger motor and then get the custom chip soon after. Speed Density systems are much less forgiving of large changes in the engine's basic breathing characteristics since they don't have a MAF that directly reads how much air the engine is consuming. They have to infer it from throttle position and manifold vacuum.

 

The ZZ4 cam and L98 heads are mild enough to work with the stock computer chip, but I recommend getting the 350/automatic chip for your year. I proved that by running the stock 305 5-speed chip in my car with my ZZ4/L98/SLP combo. But when I put in the current engine with the LT4 HOT cam, I definitely needed to do my own custom chips. It wouldnt run right at all.

 

Don't forget bigger injectors. That ZZ4 is going to hate you if you use the stock 19lb injectors. You'll need an L98 knock sensor too. Add to that a new PROM, and you'll be in real good shape.

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Kewl! Thanks for the info guys.
btw if you want to see pics of my car... http://members.sounddomain.com/truone

 

Nice looking car.

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View the Restoration of an 85 IROC
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