[ESG-642T]

Originally Posted by Lumoon Isnt the wiring harness to the ECM different in the mustangs than the pickups? I always see junkyards selling motors and harness' The 4.2 I looked at had the harness and the guy was selling the adapter to extend the wires like 6 inches to reach the mustang ECM. But stupid stuff like that is part of the reason I don't have a 4.2... And when I fix the 2nd half of the why I don't have a 4.2 I'll yank the current block and have it gone through and bored, stroked, and stuffed, maybe 4.2 or 4.3 haven't made up my mind yet. Havent seen enough numbers on the 4.3 long rods vs the 4.2s I understand its a direct bolt up and it reuses almost everything from the 2001-4 I don't think much of the 2000 and older stuff is any good with the 4.2 swap. But I have only done the surface research, haven't really got in and gotten my hands dirty. I know when I go 4.2 it will be a H/C/I/SC with forged internals. But as I said before that's just me.

Mike said it best:
Do you need a wire harness to take your block put a 4.2 crank in it?? Nope

[6ixer]

Ok confused....do I need any wiring b.s from the f150 or should I be able to pull both engines and just drop the 4.2 in my car and reconnect everything and be on my way...in terms of just conneect/bolth the 4.2 up to my tranny then the mounts...then connect all of the wiring hoses ect put oil coolant back in ect then batter...then start...or is tht to easy

[6ixer]

How is he an execption lol does he have bigger fuel injectors or dome pistons or wat....a weird tune??

Cuz tech I should put down around 25o is he's doing 230s

[mustangmike!]

250 at the crank maybe 0_o

lol

Sir, being an internally balance and 04, mine was a SIMPLE swap. Not to sure on yours as to how that works w/ external balance which im sure you have.

[walt1120]

i really wanna see what a stock 4.2 cam would do in a 3.8.

you dont even need to change springs or anything since they have the same lift, seems like such a cheap mod. the motor would probably respond much better to bolt ons aswell

[qwiksilvermustang]

if you have external balance like me which you probably do, you'll be needing a new flywheel to swap to the internal balance 4.2, also he'll keep the balancer thats already on the 4.2. everything else is the same.

[mustangmike!]

Mike is selling a 4.2 cam
I think a dyno has been done but on a single port which is useless info.
It ought to sound a take bit better then the stock cam too.

People say an increase of 5ish hp and like 10+ tq. Thats almost the same as a windstar kit and Id let it go much cheaper then 450 lol

[mustangmike!]

Originally Posted by qwiksilvermustang if you have external balance like me which you probably do, you'll be needing a new flywheel to swap to the internal balance 4.2, also he'll keep the balancer thats already on the 4.2. everything else is the same.

Or get a UDP w/ ext balance :p

the 4.2 is an 98 though int or ext ?

[walt1120]

yeah the sound must come from the 116lsa vs the 110lsa. i think the you would get more than 5 hp and 10tq though because the motor would probably respond to bolt ons a little more. whereas it seems boltons dont do squat to stock splitport.


99-04 3.8v6s: 178/194. 116 LCA 111 IC, .247/.258

96-98 3.8v6s: 184/202. 110 LCA 105 IC, .245/.259

even the single ports have a better cam than the splitport 3.8.

its no wonder why a cam swap unlocks so much power on these motors. the stock cam is definitely what limits this motor. usually on most cars its the intake or the heads but theres no doubt the small ass cam in the splitports is the reason why adding a cai or tb adds like 1hp..its because this motor gets plenty of air with the stock intake and heads, it just doesnt have a big enough cam to match the air supply.

[qwiksilvermustang]

Originally Posted by mustangmike! Or get a UDP w/ ext balance :p the 4.2 is an 98 though int or ext ?

I was to understand that all 4.2 engines were internal balance, only the 3.8 had the internal/external differences after late 2000

[qwiksilvermustang]

Originally Posted by mustangmike! I used this: The engine balance isn't dependent upon the block, but rather the crankshaft. Since all 4.2 crankshafts are internally balanced, you cannot reuse your external balance harmonic balancer even if you reuse your 3.8 engine block. You will also need to use the correct flywheel/flexplate. __________________

yea, i'm right about something, yea, A.A Yea