68 GTO fit in a 2004 Grand Prix GTP


Asked by Jun 25, 2015 at 10:38 AM about the 2004 Pontiac Grand Prix GTP

Question type: Car Customization

I have to get a new engine for my 2004 GTP pontiac.. and i was wondering  if a 68 GTO
engine Block can fit into a 2004 Grand Prix GTP Supercharged?

4 Answers


No. Everything on that newer engine is run by computer. The older engines didn't run by computer. Even if you did bolt in in there, the transmission will not work either. Older engines were mounted front to back. New engines are usually mounted sideways. If your car is front wheel drive, there's no way that engine can be mounted that way to your existing transmission. Not to mention your entire wiring harness will be useless. You need another engine like the one that came with the car.

James Kitlas

Those engines are very different, I don't believe you can mix & match the old with the new.Also transmitions are different. You can install anything into anything IF you have a lot of cash & willing to do some welding mods. I'd stick with something comparable from 2004. The 2004-06' GTO uses a Chevrolet LT-1 V8.


Not sure what you have for GTO parts kicking around, but, if you have a complete GTO engine with a tri-power, you may be able to sell it and have enough money to put in the same engine that originally came with the car. Just a thought. Does the top of the engine look like this pic? If so, it's worth some serious money.

James Kitlas

Old 66' GTO's were 389's, & tri--power (3, 2 bbl Rodchecter carbs) & 67' changed too 400's, & were a 4 bbl Quadra-jet carb. Both not as much hp as LT or LS series Chevrolet V8's as in the newer HSV high perf cars. ref: Holden Special Vehicals, of Austraila. They have a GTO pickup called the "Maloo'", very cool but right hand drive.

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