Ford 4.2 crank & rods in 3.8 block ? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-11-2008, 06:25 PM
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Ford 4.2 crank & rods in 3.8 block ?

How 'bout it
Is it a drop in?
That would be nice.
Sisters 2001 3.8 mustang burned lower end
What are the diffs between these motors...
2001 3.8 12 intake ports
1998 3.8 6 ports
I know there is different cranks and rods thruogout the years but can any body shed some lite on interchangeability.....
sounds like a cool hop up to me
The lower part of the 3.8 cyl's look like they might need clearanced, but at any rate if journal sizes etc were the same,etc.,I will always go for a stoker kit if the bottom end is all burned up anyway. ...IF...

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Old 01-11-2008, 09:09 PM
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I've never have come across a article, or heard of anyone doing this before. I don't know if it is even feasible to be done. Maybe someone on here knows. The least I would do is take it away from your sister, and drive it yourself.
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Old 01-11-2008, 11:35 PM
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I would But she needs to pay 5000 bucks first....Payments...
She has to pay that much on her payments
I would like to fix her up with a 4.2 thought...
Will the Control Unit handle it?
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Old 03-11-2008, 02:33 PM
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3.8 = 4.2

Yes, you can use a 4.2 crank in a 3.8, but you must use 4.2 pistons since the pin location is different than a 3.8. The rods are the same length and all journal sizes are the same. The balance is different, but you said it was after 2001, so it's ok. The torque is much higher and this swap adds lots more horsies. You can best a 4.6 if done right. I am doing this to my 96 stang presently but I am also including SPI heads and intake which you already have. I am porting and polishing the heads and getting a 70MM throttle body, roller rockers and a cam. I have dual Borla side exhaust and a 8.8 locker 3.25 rear. These little stangs really run like this, and don't be afraid of the big bad V8. Just remember if you get an engine or a crank, stay with a Rear Wheel Drive vehicle, the Front Wheel drive engines are different.

GaryLG
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Old 10-11-2008, 04:24 PM
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Quote:
Originally Posted by GaryLG
Yes, you can use a 4.2 crank in a 3.8, but you must use 4.2 pistons since the pin location is different than a 3.8. The rods are the same length and all journal sizes are the same. The balance is different, but you said it was after 2001, so it's ok. The torque is much higher and this swap adds lots more horsies. You can best a 4.6 if done right. I am doing this to my 96 stang presently but I am also including SPI heads and intake which you already have. I am porting and polishing the heads and getting a 70MM throttle body, roller rockers and a cam. I have dual Borla side exhaust and a 8.8 locker 3.25 rear. These little stangs really run like this, and don't be afraid of the big bad V8. Just remember if you get an engine or a crank, stay with a Rear Wheel Drive vehicle, the Front Wheel drive engines are different.

GaryLG
Dont understand it was after 2001 so its o.k.
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Old 10-11-2008, 04:40 PM
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4.2 crank

these posts are from months ago but if interested i know guys using a 4.2 crank and 3.8 sc rods and pistons { dont know if the same as standard 3.8}
all they did was mach .200 off 2 counterweights and check balance and done
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