redass02gt

96-98 is npi
99-04 is pi

03sonicgt

I wouldn't necesarily say don't waste your time with a npi engine. If you ever plan on doing any headwork or cams, why not save money on a car, and just get a 96-98 gt?? Save money on the car, and do a full pi swap with new heads, cams and an intake. You could easily see 310rwhp+ with full bolt-ons. BCisme did it.

2000GT4.6

The only problem with going with a NPI engine is that if you do a PI swap later on, you raise the compression ratio. So if you ever plan on forced induction its a handicap.

Also, you will have to put up with the PITA of having a NPI engine in a car. It will definatly perform better than a 3.8, but it is still a low output 8, and it will not respond well to cheap bolton parts.

I would probably just stick with the 3.8 if I only had the choice between it and a NPI swap. The swap will be much more costly than just putting a stock 3.8 back in the car, the gas mileage is gonna take a big hit, and the performance will not be that great with the NPI engine anyway.

amoosenamedhank

You must have misunderstood me. I didnt say buying a 96-98gt was a waste, I said swapping to a 4.6 npi engine was a waste. He already has a sixer and he wants to swap a 4.6 into it. I told him not to use a npi engine and just build a pi engine or at least start with a pi engine. I don't know about an easy 310rwhp. I have a 96 gt with the 96gt flat top pistons and pi swap full bolt ons and a stage 1 cam and I'm only making 286rwhp. I wouldn't say hitting "310rwhp+" is an easy task especially on a stock bottom end which you don't want to spin higher then 6k.

03sonicgt

I defanitely misunderstood the post fellas, but you guys understand my point.

amoosenamedhank

Well he could start with a npi engine if he got a really good price on it and swap to a pi set up. That could work you would actually make a little more compression=more power good idea as long as you aren't planning on boost. It all depends on how much your getting the npi engine for. I just don't think in the long run you will be happy with a stock npi engine. Or even a bolt-on npi engine. No matter how you do it I would look into ending up with a pi set up.

2000GT4.6

yeah but basically you won't pay that much more for a used PI engine, and it is worlds above the performance level of a NPI car off the start. It has better potential and there is a bigger aftermarket for it.

Red3

I would prefer the PI engine but I don't know if the mechanic will do it or not. Basically he is buying it and all and I will be paying him a certain amount out of every pay check to pay for it. The PI engine is out of a 00 Saleen. The guy with the engine said he isn't sure if he has the com and all the wiring harnesses I would need for it. The NPI is going to run me about 1500 installed. I think the Pi engine is going to be about 1100 just for the engine and all.

2000GT4.6

for 1500 bucks so long as you are not looking for stellar performance or to do a ton of mods down the road you really cannot go wrong.

I would think the 3.8 would cost you dammed near as much to get installed and all anyway.

Red3

Yea, the 3.8 is gonna be around 1500 after taxes and all. The NPI will prob be around 1700 after taxes. The PI is going to be about 1100 just for the engine. I'm trying to decide what to do tonight cuz in the morning hopefully they process wil start. Should I talk to the mech and see if he will be ok with doing the PI motor?? Is it worth the extra money?? Like the guy was saying earlier, I am used to driving a v6 so even if I go with the NPI it will be a step up and the PI will be like 2 steps up. I already have an 8.8 with 3.73's in. How well will the stock clutch and tranny hold up? Will they bolt right up? I want the PI but am trying to decide if it is worth the extra money if he can find all the pieces I will need. If he cant would it be ok for me to just go to a junkyard and get them out of another car??