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Unread 11-22-2011, 02:20 AM   #1
jeepmanstancj7
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1982 CJ7 
 
Join Date: Sep 2010
Location: prince gorge, british columbia
Posts: 46
cj 4.0 stroker build

so my baby needs a new heart and up until a few days ago i was going to do a 4.0l head swap on to a rebuild 4.2 block, but i found a 4.0 l head on a good 4.0 block (or so he says) for cheap

now for what i have been reading since then i could, in theory, take the crank from my engine throw it in that block with new 4.0 l pistons and the 258coneting rods mill down the block to get the right quench height and i would have a 4.6L stroker i could throw a 4 brl carb on and drop right in to the cj for the price of rebuilding the 258 form the ground up... right

or am i missing something

thanks

o and id appreciate no one telling me to do flue injection if i build it its getting carbed

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Unread 11-22-2011, 03:58 AM   #2
gmakra
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1985 CJ7 
 
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Location: Chicago area
Posts: 2,796
In theory yes your correct. Using a carb is a good idea since the FI route is a little finicky
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Unread 11-22-2011, 09:38 AM   #3
Destr0
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1994 YJ Wrangler 
 
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My brother has built a couple of these and swears by them. I have a 4.0 sitting in my garage waiting to do this, and twice I have gotten a cheap or free 258, but twice now CJ buddies have needed a cheap 258 to bring a dead rig back to life...

My project is now SBC powered so not sure if I will ever build a 4.6... Maybe.
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Unread 11-22-2011, 10:59 AM   #4
letchcore
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1983 CJ7 
 
Join Date: Apr 2007
Location: Nashville, TN
Posts: 145
Quote:
Originally Posted by jeepmanstancj7 View Post
so my baby needs a new heart and up until a few days ago i was going to do a 4.0l head swap on to a rebuild 4.2 block, but i found a 4.0 l head on a good 4.0 block (or so he says) for cheap

now for what i have been reading since then i could, in theory, take the crank from my engine throw it in that block with new 4.0 l pistons and the 258coneting rods mill down the block to get the right quench height and i would have a 4.6L stroker i could throw a 4 brl carb on and drop right in to the cj for the price of rebuilding the 258 form the ground up... right

or am i missing something

thanks

o and id appreciate no one telling me to do flue injection if i build it its getting carded
You will lose 50HP by going carb instead of FI. Not to mention all the other benifits of FI offroading but hey you seem to have it all figured out.
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Unread 11-22-2011, 12:53 PM   #5
addicted2dunes
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FI won't flood out on steep inclines, It automatically adjusts to elevation changes. I hated carbs offroad, they always seem to flood and bog down right when you need it the most.
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Unread 11-22-2011, 02:29 PM   #6
jeepmanstancj7
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1982 CJ7 
 
Join Date: Sep 2010
Location: prince gorge, british columbia
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im not going to have this thread turned into the your an idiot becuse u dont want FI bash fest, most people dont like carbs becuse they involve you learning how to tune them to get your rig to run right, besides i dont have rocks or trails that have hills on them we have mud and 8 months of the year losts of snow thats what i wheel in

thanks for the input tho
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Unread 11-22-2011, 02:38 PM   #7
addicted2dunes
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Because they don't know how to tune them? No, it's because the fuel flows out of the bowls down the intake, nothing to do with tuning. Geez, well then, why not do the research, I found tons of internet write-ups on building a stroker motor.
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4.0 swap , cj7 , engine rebuild , stroker

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