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M –32
Lomira, Wisconsin
United States


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1991 Chevrolet Beretta GTZ (Bad GTZ)

Last updated Dec 5, 2010  

Photo of a 1991 Chevrolet Beretta GTZ (Bad GTZ)


I bought this car from the original owner. Took a bus to Missouri from Wisconsin on my first wedding anniversary alone.

Wife is gone, the GTZ is still in the garage. She was in fair shape when I picked her up, Maaco paint job, and hail damage, but I didn't care, I got behind the wheel and reved that Quad to the line and that's all it took. Drove her till the motor let go at 215k. She sat for a few years while I went through selling my house, getting divorced, buying a new house and I've been slowly collecting parts while I waited for time to complete her. That time will come this winter.


Currently she sits with an empty engine bay. Motor build is in progress. See modifications.

Factory Options

Has all the standard GTZ options. Power windows, power locks, cruise, tilt wheel, ETC.


Where to start? Car is far from stock. Currently sits in a state of incompletion. Ive deleted not only the air conditioner, but the heater as well. All ducting has been removed, and block off plates fabbed. My engine build is in progress. I wont share to many trade secrets, but the basics are as follows. Im starting with a 91 Quad HO block. Forged 2.4l twin cam crank with the journals turned down to match the 2.3l block. With a slight overbore this results in a stroker utilizing the stock length Twin Cam rods, with a displacement of 2.6l. While this limits the rev potential, this helps the lower end torque, as well as keeps the lifters from grenading. Pistons have been ordered that will result in a final compression of 9.5 to 1.

I have not yet finalized my plans for my FI setup. I will either be using my existing M62 setup, or a a Powerdyne supercharger if I decide to go the SC route. I have interest in pursuing a turbo setup, but this is unlikely. Based off my previous builds, and some additional calculations, I should end with at least 400hp at the crank, no small feat for a 4 cylinder imo.

Trans plans are typical, Getrag 282 with an LSD. My trans is from a 93 Quad, which has the 3.94 gears. My experience is that on a stock Quad, this gearing change accounts for a half second in a 1/4 mile.

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