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Old 07-28-2012, 01:56 AM   #1
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Head swap

I'm sure this topic has been brought up a million times but I just wanna make sure it's done right and I wanna get your guys' input and experience from this project
But I'm really looking into the 4.2 swap and I just want to know what I need to expect to do to successfully do this
I have a 01 and I've read that I can swap heads from a 4.2 and just use the internals
Is there anything special id need?
Let me know what you think about this project with a 3.8 block with 126xxx on it
Thanks!!
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Old 07-28-2012, 10:37 PM   #2
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Re: Head swap

Building a motor is hard dude your better off just buying the 4.3 shortblock from ssm its 4000 grand i think then just move your heads intakes and acc's to it from the old one.if you go the other route keep in mind you have to have the block machined the used crank and rods will have to be checked out you need different pistons so you dont destroy valves and after you've done all that you still have to pay someone to put it all together and after that you still need to get in the car and put the top end back together which is easy but time consuming and time is money and at the end of everything you"ll save like 400 all the work you avoid buy just buying one is worth way more then 400 bucks
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Old 07-28-2012, 10:43 PM   #3
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Well its not the heads. The inside is what you need but i would just swap the motor
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Old 07-28-2012, 11:44 PM   #4
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Quote:
Originally Posted by l2plagears
Building a motor is hard dude your better off just buying the 4.3 shortblock from ssm its 4000 grand i think then just move your heads intakes and acc's to it from the old one.if you go the other route keep in mind you have to have the block machined the used crank and rods will have to be checked out you need different pistons so you dont destroy valves and after you've done all that you still have to pay someone to put it all together and after that you still need to get in the car and put the top end back together which is easy but time consuming and time is money and at the end of everything you"ll save like 400 all the work you avoid buy just buying one is worth way more then 400 bucks
I'll look at tht other one for 4k
I know I'd have to have everything machine but putting it all back together I can do
Maybe I'll just go to a yard and try to find a motor and just have it looked at
My buddy picked one up for only 200 and it had absolutely nothing wrong with it so that's why made me wanna do the same thing
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Old 07-29-2012, 12:44 AM   #5
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Re: Head swap

the 4.2 and 3.8 have the exact same block... and since you just have stock heads on your car, they are exactly the same as the 4.2's, drop the motor right in there it'll be just fine all you have to do is swap some stuff over from your car to that motor

as to assuring it's fine you can check it without having to pull the heads, get the 4.2 on an engine stand and flip it upside down, turn the crank over by hand and watch each piston one at a time, look for any gashes/marks in the cylinder walls

and when you pop the drain plug on the oil pan look at the oil in it, is it milky? or just black from being old, if milky it's been exposed to water, in witch case i would replace the head gaskets as a safety measure (with new head bolts of course)

if you know for sure it was a low mileage motor it would be good, but honestly they last forever it seems even abused to hell like mine lol try for under 80K though

i bought my motor for 300 a complete motor and am getting rid of parts from it to make a little money back

btw the sticky at the top of the sixer section has the list of parts you must swap over to the 4.2 motor

also it would be a good idea to oil the motor a little before you try to start the car, just squirt a little oil in through the spark plug holes and turn crank over by hand to get it in the rings some, if for some reason you must pull the heads off do it while they are off it'll be easier
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