4.2 short block - Mustang Evolution

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Old 06-29-2013, 03:50 PM   #1
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4.2 short block

I'm lookin into buying a 4.2 short block for my car, and was wondering if anybody knows if the 3.8single port heads will bolt up to the 4.2 bottom end? Also what would the car run like with the stock cam from the 4.2? Could I use the 4.2 pushrods with my 3.8 rockers or would I need all new?
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Old 06-29-2013, 03:55 PM   #2
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Are you thinking of the 4.2 from the F150? If so yes, it will bolt on
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Old 06-29-2013, 03:59 PM   #3
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Yea that's what I'm lookin to get. And can I use the pushrods from the 4.2 with stock 3.8 rockers or do I need the 4.2 rockers and pushrods?
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Old 06-29-2013, 04:04 PM   #4
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I'm not too sure. I think I've seen that you should replace the lifters. Lemons95 and davidseifert have done the 4.2 stroker. I'm sure they'll chime in
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Old 06-29-2013, 04:09 PM   #5
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I'm not too sure. I think I've seen that you should replace the lifters. Lemons95 and davidseifert have done the 4.2 stroker. I'm sure they'll chime in
So I have to change out the 4.2 lifter? Or can I use the lifters, pushrods and rockers from the 4.2 on the 3.8 heads?
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Old 06-29-2013, 05:09 PM   #6
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The cam changes, so you need rockers pushrods, and lifters. Any thing else will throw off the roller geometry. A little F.Y.I. the heads are the same and nothing else is on the top half.
A easy check is to compare numbers on your favorite parts store sight. That is the easiest way to compare interchangeable parts.
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Old 06-29-2013, 10:36 PM   #7
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The cam changes, so you need rockers pushrods, and lifters. Any thing else will throw off the roller geometry. A little F.Y.I. the heads are the same and nothing else is on the top half.
A easy check is to compare numbers on your favorite parts store sight. That is the easiest way to compare interchangeable parts.
So can I just use the 4.2 pushrods lifters and rockers? And the 4.2's are split port I have single port
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Old 06-30-2013, 12:13 AM   #8
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So can I just use the 4.2 pushrods lifters and rockers? And the 4.2's are split port I have single port
I'm in over my head. Not sure about single port/ split port interchangeability.
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Old 06-30-2013, 01:24 AM   #9
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4.2 is a 3.8 just different stroke.. heads from mustang bolt straight to f150 4.2 .. if your wanting to build your heads your wasting your time builds with stock parts.. upgrade rods springs lifters or make it a roller P&P them call it a day.. David gots a monster v6 he didn't do the stroker.. he got a used 4.2 bottom in a stuck it in his 3.8 block created his own monster.. him and Luis Ortiz.. his heads and lower and upper all special created for him..
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Old 06-30-2013, 11:05 AM   #10
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Single-ports work fine with the 4.2 stroker. it's exactly what I have. Lot's of torque just not as much HP as I'd like.
I was going on a really tight budget. I replaced a few connecting rods and replaced all the bearings, pistons and rings...
Naturally aspirated split-ports are better, but I've heard that the single-ports are stronger and can handle boost better.
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Old 06-30-2013, 01:03 PM   #11
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Single-ports work fine with the 4.2 stroker. it's exactly what I have. Lot's of torque just not as much HP as I'd like.
I was going on a really tight budget. I replaced a few connecting rods and replaced all the bearings, pistons and rings...
Naturally aspirated split-ports are better, but I've heard that the single-ports are stronger and can handle boost better.
So could I just use the 4.2 lifters pushrods and buy aftermarket roller rockers to make the setup work though? That's what Im asking
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Old 06-30-2013, 09:20 PM   #12
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Went and did some research on the single port 3.8. The factory rockers, lifters, and pushrods will work on a single port 4.2. Don't go with CC rocker arms because they are hard. Machine work is necessary, unless you go with supersixmotorsports rocker arms.
Stick to the factory setup.
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Old 06-30-2013, 10:06 PM   #13
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But if I plan on switching all of that over to my 3.8 heads I mind as well throw on a set of roller rockers
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Old 06-30-2013, 11:08 PM   #14
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Quote:
Originally Posted by samuelsmith View Post
Went and did some research on the single port 3.8. The factory rockers, lifters, and pushrods will work on a single port 4.2. Don't go with CC rocker arms because they are hard. Machine work is necessary, unless you go with supersixmotorsports rocker arms.
Stick to the factory setup.
SSM will send you a set of comp cam pro magnum roller rockers
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Old 06-30-2013, 11:16 PM   #15
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I used the stock parts. I'm pretty sure the 4.2 I found had low miles though. 1997's had a huge gasket problem that would cause them to sometimes blow a head gasket. This one also had two bent connecting rods.
Can't complain though, got it for free.
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Old 07-01-2013, 10:14 AM   #16
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I used the stock parts. I'm pretty sure the 4.2 I found had low miles though. 1997's had a huge gasket problem that would cause them to sometimes blow a head gasket. This one also had two bent connecting rods.
Can't complain though, got it for free.
Did you use the 4.2 heads, or the 3.8 heads?
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Old 07-01-2013, 03:39 PM   #17
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I used the 3.8 heads, which is why it's still single-port.
4.2 heads won't work with the single-port intake.
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Old 07-01-2013, 09:10 PM   #18
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I used the 3.8 heads, which is why it's still single-port.
4.2 heads won't work with the single-port intake.
What pushrods and rockers did you use?
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Old 07-01-2013, 09:13 PM   #19
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The 3.8 pushrods and rockers.
The 4.2 ones might work. I used the 3.8 because I didn't have the 4.2 parts.
it had 2 heads(one cracked) it was missing some bolts too. I got it from a high school auto shop in pretty rough condition.
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Old 07-01-2013, 10:36 PM   #20
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The 3.8 pushrods and rockers.
The 4.2 ones might work. I used the 3.8 because I didn't have the 4.2 parts.
it had 2 heads(one cracked) it was missing some bolts too. I got it from a high school auto shop in pretty rough condition.
And it runs just fine with all the parts from the 3.8?
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Old 07-02-2013, 12:59 AM   #21
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the only parts that are different are the crank, pistons and connecting rods.
the oil pan is also different, but that's because it was made for a truck. when you put it in your car just use the mustang oil pan.
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Old 07-02-2013, 11:45 AM   #22
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So the pushrods and rockers are the same
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Old 07-02-2013, 02:11 PM   #23
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the 4.2 heads are just 3.8 split-port heads.
if your keeping your single-port heads just use the single-ports pushrods and rockers.
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Old 07-02-2013, 02:20 PM   #24
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Ok thanks, I plan on buying the whole 4.2 motor so maybe I could sell the top end to somebody haha
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Old 07-02-2013, 03:00 PM   #25
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Ok thanks, I plan on buying the whole 4.2 motor so maybe I could sell the top end to somebody haha
If its lowish miles I might buy the stock heads from you
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Old 07-02-2013, 06:48 PM   #26
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If its lowish miles I might buy the stock heads from you
The one I was lookin at only has 68,000 on it
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Old 07-02-2013, 07:21 PM   #27
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Sounds good
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Old 07-02-2013, 08:42 PM   #28
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I'll let you know when I get the motor then, hopefully in Tue next couple weeks here
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