Important Investments for motor refresh

[LittleD]

So im right in the middle of doing the build on my spare motor, it's a 4.0 out of a 89 xj with 104k. I'm having everything boiled out, porting/polishing the head, glaze breaking it, honing it. I was debating having the head shaved a bit but not sure if i wanna go that far into a build. What are some smart investments to help with fuel economy and still get better torque.

So far i have these on my list

http://www.summitracing.com/parts/CCA-K68-232-4/

Going to attempt to get it to run a bit cooler
http://www.summitracing.com/parts/GMB-110-1090P/

http://www.summitracing.com/parts/SLP-260-1762/

My totals:

Boil out everything and installed cam bearings $250
Valve Job $240
Cams and whatnot $340
Oil pump ~60 with my work discount
Water Pump $70
Gasket Kit $86
And im gonna say maybe another $100 in other needed things

So im at just below $1200 for a rebuild, sound reasonable?

[Ruepart Hoaxley]

More torque and better economy? Get a better torque converter too.

[clean4drxj]

Look into a better injector(better spray pattern), and a newer TB swap. Also if you did oalready purchase the water pump look into a flowcooler.

[LittleD]

Im going to use my current water pump, it has like ~3000 miles on it. Im probably going to covert to a open cooling system which doesn't look too hard. How many core should i go with, i was thinking 3.

I've been planning on doing the for explorer v8 injectors because they have a better pattern and with the msd thats going in the jeep, i figure it would be worth it. Planning on going with a throttle body spacer, and porting out my current TB.

[Zullock Holmes]

I've been told a 4.0 head doesn't have a lot of room for a serious port. hesco makes replacement heads and even an aluminum one that are supposed to be much better.

I'm throwing roller rockers on mine, just cause i think it'll be more efficient at higher rpms. You can get them on summit.

I've also heard of people throwing mustang injectors on them.

[wannabejeep]

I did mustang injectors on my last one, didn't notice any differences in power or fuel economy.

[clean4drxj]

I've been told a 4.0 head doesn't have a lot of room for a serious port. hesco makes replacement heads and even an aluminum one that are supposed to be much better.

I'm throwing roller rockers on mine, just cause i think it'll be more efficient at higher rpms. You can get them on summit.

I've also heard of people throwing mustang injectors on them.

The aluminum head is a way to go if you want to get rid of weight, increase compression(still running pump gas), more power and probabley slightly better fuel mileage.

[Zullock Holmes]

http://www.perfectengine.com/Jeep_4_...th-rmj242b.htm

full gasket set, rings, rod bearings, and main bearings for $110

http://www.perfectengine.com/Jeep_4_...th-rcj242c.htm

pistons and rings for up to .040 over bore; rod, crank, and cam bearings; timing set; oil pump; freeze plug and gasket sets for $350

[LittleD]

Dont need pistons, the others are in great shape, gonna clean em up and throw them in. If i was planning on keeping this thing forever, i would put more into it, but i don't plan on it.

[clean4drxj]

3 core, check radiatorbarn.com it's all metal.

[LittleD]

Being im going to have to buy injectors for this, i was looking into doing a injector with a 4 hole nozzle vs the stock 1 hole. So far i've heard the 2.4l Neon injectors (703's) have a better flow rate then doing the v8 injectors. Being i have a renix era, with just 1 o2 sensor, will doing a upgrade be beneficial? Putting in the msd 6a when i do the engine swap and keeping the K&N open air filter.

I've been researching the 2.4l injectors and it looks like it has a two pin connector vs the jeep which has a two flat pin spade style connector.

[clean4drxj]

I've heard alot about people swapping in the 703's for the earlier xj's, as far as that MSD box goes.. you'd be better off with a good coil & set of wires(less problemattic).
I run the DUI kit in mine and it's been great, also allowed me run a larger gap with my spark plugs and when I installed it my jeep generally only cranked over once or twice before starting(did matter how long it sat).

[LittleD]

I run the auto light wires, and i looked into a coil, but no one really makes a upgraded one for the older xj's

[LittleD]

Would there be any real benefit of replacing the stock header with a performance one? Looking into this one because it comes with everything to get me to the cat.
http://www.quadratec.com/products/77604_701.htm

Would that and the current flowmaster help with mpg/sound?