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Old 09-23-2012, 07:20 PM   #1
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anyone swap to 4.3 liter

Has anyone here swapped to the 4.3 liter? Can you compare it to the 3.8 for me?
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Old 09-25-2012, 12:19 AM   #2
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my friend did...it was quick even with the stock rear end and 3.27's...wish he would have put in gears and a tlok before selling it
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Old 09-25-2012, 02:25 AM   #3
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There's a kid in town who did this swap. He made 178rwhp. He then added a 03 cobra blower. Then he made 171hp. That's not a typo. His tuning is mucked. He's in for way more money than its worth.
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Old 09-25-2012, 06:54 AM   #4
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Im thinking of getting the motor from supersixmotorsports. Ill save up and just have all motor c/h/i. And a set of 4.10 gears
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Old 09-25-2012, 07:05 AM   #5
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Quote:
Originally Posted by DaBluedude
There's a kid in town who did this swap. He made 178rwhp. He then added a 03 cobra blower. Then he made 171hp. That's not a typo. His tuning is mucked. He's in for way more money than its worth.
Hmm, just the swap? No upgraded parts like cam? Heads? Stuff like that? Once I'm done with my H/C/I, LTs, X-Pipe, T-Lok and 4.10s I should be making 220-240rwhp
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Old 09-25-2012, 10:07 AM   #6
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Quote:
Originally Posted by xhgwx

Hmm, just the swap? No upgraded parts like cam? Heads? Stuff like that? Once I'm done with my H/C/I, LTs, X-Pipe, T-Lok and 4.10s I should be making 220-240rwhp
I don't know for sure about cam but he did a little work on the heads. It isn't worth it. I'm a V8 guy. It's cheaper and easier and is a better platform from there in my eyes. I know you can make crazy 6 cars. But the drive ability goes down fast.
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Old 09-25-2012, 01:51 PM   #7
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Quote:
Originally Posted by DaBluedude

I don't know for sure about cam but he did a little work on the heads. It isn't worth it. I'm a V8 guy. It's cheaper and easier and is a better platform from there in my eyes. I know you can make crazy 6 cars. But the drive ability goes down fast.
This is also true, after I'm
Done I'll see 16-17 city and 13-16 HW.
But mine was given to me so I can't complain at what I got, I'll just make it into something I want.
Next mustang will be a v8 tho.
Really want a fox body
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Old 09-25-2012, 06:14 PM   #8
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I hope not. the 4.3's a chevy engine...
if your talking about a 4.2 bored out to 4.3 though
a stock 4.2 is suppose to be making around 220.

Me and my dad just finished mine a couple weaks ago we have just a little less then 150miles on the engine.
I still have the singleport heads but theres a noticeable power difference in it. I also used the cam that came with the 4.2 I don't know how much of a difference that made though.
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Old 09-25-2012, 07:07 PM   #9
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I can just get my 3.8 block bored out to a 4.2 right?
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Old 09-25-2012, 07:19 PM   #10
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Quote:
Originally Posted by 97cutomstang
I can just get my 3.8 block bored out to a 4.2 right?
Yes, u can even bore it to a 4.3
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Old 09-25-2012, 07:27 PM   #11
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thats kinda pushing it though.
you could stroke and bore it out more though like 4.4. I've seen one 4.5 I think stroked to 4.2 and bored to 4.3 would be the safest.
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Old 09-25-2012, 07:59 PM   #12
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Quote:
Originally Posted by lemons95
thats kinda pushing it though.
you could stroke and bore it out more though like 4.4. I've seen one 4.5 I think stroked to 4.2 and bored to 4.3 would be the safest.
What is the difference in stroking vs boreing?
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Old 09-25-2012, 10:33 PM   #13
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Quote:
Originally Posted by DaBluedude View Post
There's a kid in town who did this swap. He made 178rwhp. He then added a 03 cobra blower. Then he made 171hp. That's not a typo. His tuning is mucked. He's in for way more money than its worth.
something is wayyy off..even on a stock 4.2 build my friends m112 swap made over 300
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Old 09-25-2012, 10:34 PM   #14
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Quote:
Originally Posted by 1slosix

something is wayyy off..even on a stock 4.2 build my friends m112 swap made over 300
Ur alive! How was insanity?
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Old 09-25-2012, 11:08 PM   #15
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Quote:
Originally Posted by 97cutomstang

What is the difference in stroking vs boreing?
Stroking it basically is putting a longer connecting rod in to lengthen the travel of the piston. Boring refers to putting a piston with a bigger circumference in the cylinder. Your cc is Bore x Stroke. Bigger bore and stroke = more cc/liter = more power.
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Old 09-25-2012, 11:13 PM   #16
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Sorry I kinda lied. When stroke a motor you get a crank that makes the stroke longer. Some times you can use the same length connecting rods but some kits might give you different connecting rods. Stroke kits will always have a stroked crank. I would of deleted and rewrote the comment above but couldn't.
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Old 09-26-2012, 12:25 AM   #17
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Quote:
Originally Posted by Kingmidas87
Sorry I kinda lied. When stroke a motor you get a crank that makes the stroke longer. Some times you can use the same length connecting rods but some kits might give you different connecting rods. Stroke kits will always have a stroked crank. I would of deleted and rewrote the comment above but couldn't.
But with a longer stroke you need a lot of different things so you don't come in contact with the heads?
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Old 09-26-2012, 12:43 AM   #18
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Yeah that's wear the different length connecting rods come in.
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Old 09-26-2012, 06:11 AM   #19
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Ok good to know. My plan is to use my 3.8 block, a 4.2 crank, 3.8 connecting rods and 4.2 pistons. Is that go in the right direction?
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Old 09-26-2012, 09:00 AM   #20
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Drivability going down? I guess you're referring to the mileage I daily drive my little 242rwhp sixer and no problems.. Just average 16mpg which if you're worried about gas mileage modding cars is not for you lol

A stock 4.2 makes ~202 crank hp

To get a true 4.3 you must bore a 4.2 motor over .050" which is not the best of ideas if you plan a stupid amount of boost

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Originally Posted by 97cutomstang
Ok good to know. My plan is to use my 3.8 block, a 4.2 crank, 3.8 connecting rods and 4.2 pistons. Is that go in the right direction?
They have the same block.. Why not just pull a 4.2 from an f150 and call it a day, less work and hardly ever have to rebuild them
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Old 09-26-2012, 09:08 AM   #21
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That was my original plan but finding a 4.2 around me is hard. I saw one once at a junk yard and that was it. It's going to be my winter project so I'm just going to take my time and rebuild the motor. Since they are the same block the 4.2 pistons will fit in my block right? Or do I have to have the cylinders bored out to fit the 4.2 pistons?
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Old 09-26-2012, 09:17 AM   #22
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Quote:
Originally Posted by 97cutomstang
That was my original plan but finding a 4.2 around me is hard. I saw one once at a junk yard and that was it. It's going to be my winter project so I'm just going to take my time and rebuild the motor. Since they are the same block the 4.2 pistons will fit in my block right? Or do I have to have the cylinders bored out to fit the 4.2 pistons?
Also look for freestar vans they have 4.2's

The 4.2 and 3.8 have the same 3.81" bore factory just the 4.2 has more stroke, but you really have to be careful swapping out internals if you block is in good enough shape that it doesn't require anything more than honing it should be ok with different rings

For the ease of install its easier to just wait on a whole motor...
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Old 09-26-2012, 09:25 AM   #23
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Quote:
Originally Posted by davidcseifert

Also look for freestar vans they have 4.2's

The 4.2 and 3.8 have the same 3.81" bore factory just the 4.2 has more stroke, but you really have to be careful swapping out internals if you block is in good enough shape that it doesn't require anything more than honing it should be ok with different rings

For the ease of install its easier to just wait on a whole motor...
Ok I'll have to keep an eye out for them. Thanks.
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