1995 GT Engine Rebuild + Supercharger

[95 Grand AM GT]

I have a 1995 Grand Am GT with a 3.1L v-6 3100SFI engine and automotic transmission. It came stock with 150hp. The car has about 93,000 miles on it, and I want to beef it up. I want to do a complete engine rebuild, bore the engine, and put in a supercharger. I have basic knowledge on how engines work as well as superchargers and what not but I don't have the expertise to do it myself so I'd have to take it to a shop. What all should I redo on the engine? I know I should get forged pistons and aluminum heads, but what else should I upgrade on the engine? I know this is going to be expensive, but whats a ball park estimate? And about how much horsepower do you think I'll get out of this? Also does anyone make aluminum heads for this motor? Or am I going to have to get one custom made?

Thanks for any help/advice
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1995 Grand Am GT Black
17" Chrome American Racing Rims
Weapon R Secret Weapon intake short ram
Racing mufflers
No exhaust resonator
custom painted interior
Red/Black Leather Racing Seats
Sony Xplode head unit
Sony Xplode door and rear speakers
Autotek SX2150 300W Amp
2-10" Audiopipe Subwoofers 600W RMS

[xeroinfinity]

3.4 head should work and they are aluminum.
Plan on spending a lot for a rebuild and any boring, $2000-3000 maybe more.
Plus a super charger is about $4400, and at that point I would consider buying a GTP or some other boosted car.

But internaly you'd want to upgrade your pistons and connecting rods, the cam and crank, plus chrome moly push rods, best lifters you can get. Performance bearings would be a good idea too, for everything that has one.

You wont see 200hp unless your running some boost on your 95 3.1.

I have a 3.4 block I'm getting ready to rebuild for boosting purposes. I'll be doing all the work, machining and what not, and I'll still probly spend close to $2500 or more for just (performance) parts.

Good Luck and keep us posted!

[95 Grand AM GT]

Thanks I appreciate it. Its probably going to be a while before I actually get around to doing the rebuild... Probably this summer or later. I have about 3 grand right now I need to keep saving... and gas prices aren't helping me out. I don't want to start on this project and run out of money in the middle.

Also, with all these upgraded internals on the engine, what kind of boost psi do you think it could handle? I mean I don't want to blow the engine but more air means more gas which means a bigger explosion = more horsepower = me happy

[xeroinfinity]

Gas prices are becoming a problem for me too...
After I build this I should build an electric car that never needs a plug in.

You stock engine with no engine problems could do 6-8 psi with out much trouble. Rebuilt possibly 12-15 psi , not real sure, i'll be finding out though .
Just remember 1 psi = approx 10 hp

[wafrederick]

If you find the cam bearings spun,throw the block out and it is automatically junk.The 3100 is known for breaking cams in half and washing out the cam bearings.If you think it is the cam due to being hollow in the middle,you are wrong and I know why.The block was casted in China and the cam journals were casted offset breaking the cam.GM did put in chincy cam bearings too.This is what I heard from a Jasper rep I know.Jasper fixes this problem by alighn boring the cam journals and putting in updated cam bearings which is the fix.Jasper is the only one that does this and no one else does it

[95 Grand AM GT]

What do people do to their engines to allow them to withstand 30-35psi of boost? I've seen some people do this with the twin turbo setup in the Toyota Supra... I'm just curious what they do.

[Jmoney3318]

its the transmission... the 4t45e which is on the grand am (correct me if im mistaken) cant handle as much power thus limiting your psi cause too much will cuz the tranny to go

[95 Grand AM GT]

So if I replaced the transmission or had it rebuilt at the same time my car could withstand more boost? This wouldn't have any negative effects on the engine interals since I will be upgrading the engine correct?

[95 Grand AM GT]

I'd have to get a new torque converter too to handle the increased torque... I think my car just ate my wallet

[Jmoney3318]

Originally Posted by 95 Grand AM GT

I'd have to get a new torque converter too to handle the increased torque... I think my car just ate my wallet

haha i know what you mean bro, grand ams arent cheap to hook up you gotta dish out the cash to play with the big boys, but the question about putting in a new tranny to qithstand more power is correct, im pretty sure if you rebuilt it youd be able to run 12-15 psi no problem thats with the engine rebuilt as well, ive heard of people attempting to put the g6 tranny with the 3400 motor not sure if its possible with the 3100. i wouldnt see why not. its just when you replace the tranny its so much work involved considering the fact you also have to buy the damn tranny which will cost you along the lines of like 800-1200 bux. check out milzymotorsports.com im pretty sure he sells trannys and stuff just so you can get the idea of prices and stuff

[95 Grand AM GT]

My grand am came stock with an automatic would it be possible to switch to a manual... 5-speed manual would be nice.

[95 Grand AM GT]

Thanks for all your advice guys you were a big help. I really appreciate it.