1997 Pontiac Bonneville vs 1998 Grand Prix

**chuckbattams** · 09-02-2012

I blew my s/c motor back in May and since then have been quietly looking for another. Seen lots, and to be honest, unless Your willing to pay over 500 bucks for one, they are extremely high milage 300,000 km plus. and most are, well for a lack of a better work, just plain DIRTY, not looked after properly.

Anyways, saw and ad come up with an engine from a '97 bonneville, with a supercharger on it, so to me this is swapable, and my quiestion to the smart motor people...

Is the 3.8 s/c engine from a 97 Bonneville interchangeable to a 98 GTP Grand Prix.

Thank You for reading this, and maybe answering my question.

**dsmuts** · 09-02-2012

It'll swap just use your sc

**00grandprixgtp** · 09-02-2012

ya the 97 will have a diff supercharger then urs i mean its still a m90 gen 3 blower but the vac ports are different

**Scottydoggs** · 09-02-2012

im pretty sure you will need to swap the front engine mounts off your old engine, and the lower motor mount bracket, and the coil packs and bracket, the alt, alt bracket, and re use your sc and TB and your fuel rails. maybe even the swap injectors due to wires not matching up.

double check the sensor plug ends, swap if needed.

im going off nothing but what ive read here, so this list may be a bit off. never done the swap myself.

i do know it can be done tho.

while the new to you engine is out still, its worth it to do the lim gaskets, the valve cover gaskets, and the oil pan gasket. i know gaskets cost money but they are worth doing while its out. oil pan gasket is not a easy job when its in the car. why take that chance of it leaking after its put in your car.

also take a good look at the rear main seal, make sure its dry back there behind the flex plate. if its wet change that seal too.

**chuckbattams** · 09-02-2012

Thanks for the answers, and Scotty I am taking Your thoughts of changing gaskets, better safe then sorry, plus I'm going to install headers while she's apart, ordered a new PCM from zz ... so just trying to make it right the first time

**Scottydoggs** · 09-02-2012

im sure Bill will see this post and set the swap list out in cement for you, he knows the bonnie and gp inside out.

but that wont be till after the holiday im sure.

**chuckbattams** · 09-02-2012

That's ok, tomorrow I leave to go pickup the motor in Belleville, 3-4 hr drive, be a ***** coming back though, so I'll prob grab a motel till Tuesday, that way I wont be caught up with all the returning vacationers

Thread: 1997 Pontiac Bonneville vs 1998 Grand Prix

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