I would love to give it a few more horse power. Not sure why, but I like the idea of a keeping it "in the family" if I do a swap. Thus the 1FZ.
If I stick with the 2F and just give it a refresh, maybe I can do a few performance tweaks. Exhaust manifold, FE .. that kind of thing.
youll spend way more money swapping in a 1fz for less power and less aftermarket support. Its also more work. At that point you might as well go 1uz.
There are zero performance tweaks that are worth it on the 2f. Its a low revving low power motor. Nothing you will do will ever change that. On a 5.3 you can change a plastic intake manifold, do a cam, and tune... and pick up 50+ hp all for like 2 grand in your driveway. On a 2f you can port the heads, update the valvesprings and bore it out with new pistons and gain 50 hp... for like 10 grand and it will sit at the machine shop for a few months. the 2f is not like a JZ motor where you can just throw tons of power at it and it be fine.
It really just depends on how you are planning on using it. If its a sunday driver around town never getting up above 55mph, stay 2f. If you want to drive it on the highway, make trips with it, drive up steep hills, have cruise control, go 70 mph at 2,300 rpm, actively monitor engine temps and performance, pass semi trucks, tow anything, or ever drive at elevation 5.3 or similar is the way. Ive had two 2fs one with throttle body injection, both with headers, etc and they were all dogs. One even had a H55F 5 speed. My stock rebuild 22re on 35s and 5.29s drove better on the highway than it. and it did it with 2 less cylinders. The 2f is a great torque motor for low speeds.
keep in mind, an h55f 2f truck will do 70-75mph. At 3k rpm. on an old low revving motor (that probably has 200k miles on it) that redlines at 4k rpm. That is just asking for trouble
Here is a dyno chart for a freshly built 2f i pulled from another thread on this forum
Here is a dyno chart for a completely stock gen3 5.3 to the wheels theres not really any comparison between the two and the data is all there. You are getting more torque and power at every stage of the revs and it keeps going after the 2f drops off
Seriously, find a mud member or someone local and ask if you can ride in their ls swapped truck. You wont care about "keeping it in the family" ever again.
I would 100% not get rid of the 2F on that vehicle. Do as you wish.
See above