engine swap

i was wondering if everyone knows if the qr20de would fit where a qr25de would go. i have a 2006 altima and i need to rebuild the 2.5L, and im just wanting to throw a cheap engine in it while i build it and all the sellers say the 2.0L is compatible. Thanks

I bought this car from an older lady who had someone replace the blown engine with a wrecking yard pull-out. He never got it to start good , and when the starter went bad , she did not want to put any more money into it. I replaced the starter and it will start good if I prime it a little. Fuel...

I'm getting an 03 3.5 Altima soon and was wondering if anyone knew of a skyline, silvia or 300zx engine that would fit in the bay and connect fairly easy. I love the v6 in it already but it feels sluggish and I need some raw power! I was looking and saw jdm sells import japanese engines and...