"stock" 258 and 4.0 upper

Swaping 258 to 4.0, 4.0 parts to 258 etc!
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Ironmerganser
Posts: 4
Joined: July 29th, 2011, 6:53 am
Vehicle Year: 1979
Vehicle Make: Jeep
Vehicle Model: CJ7

"stock" 258 and 4.0 upper

Post by Ironmerganser »

Been lurking for about a month and now it is time to pull the motor out and get to work!!

1979 CJ7 with 258 and 3 speed trans. My "recipe" so far (with questions) is below:

"Stock" 258 short block bored .030
4.0 clearwater head (what rockers? 4.0 or 258 push rods?)
4.0 intake (what year? what fuel rail? what lb injectors?)
4.0 exhaust header (recommendations?)
4.0 or 258 cam (stock or upgrade?)
Salvage yard engine harness (gotta find it yet)
Hesco dampner and crank sensor
Hesco speed sensor

Any other recommendations? :huh:

I know I am repeating some things, but I will be trying to accumulate everything over the next couple weeks while the 258 is being rebuilt.

Thanks in advance!!!!!! :cheers:
Ironmerganser
Posts: 4
Joined: July 29th, 2011, 6:53 am
Vehicle Year: 1979
Vehicle Make: Jeep
Vehicle Model: CJ7

Re: "stock" 258 and 4.0 upper

Post by Ironmerganser »

Anyone????
92tank
I made it to triple digits!
I made it to triple digits!
Posts: 188
Joined: August 21st, 2010, 6:32 pm
Stroker Displacement: 4.5
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: "stock" 258 and 4.0 upper

Post by 92tank »

with all the 4.0 jeep around you would be better off going with all 4.0 parts, (exept crank/rods). you can find good blocks far good price. if it was me i would find a cheap cherokee with the HO (91-95) to use as a donor, then you woud have most if not all the parts you would need.

just my honest opinion
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amcinstaller
I love JeepStrokers.com!!
I love JeepStrokers.com!!
Posts: 604
Joined: May 22nd, 2008, 11:57 pm
Stroker Displacement: 4.6L
Vehicle Year: 1980
Vehicle Make: AMC
Vehicle Model: Spirit
Location: Red Deer, AB, Can

Re: "stock" 258 and 4.0 upper

Post by amcinstaller »

having seen many an eagle owner go a similar route, i too believe you would be best served to grab yourself a rolled jeep and do an engine swap, and maybe a poor mans 4.5 stroker. also, at least use the 4.0 cam, its got a nicer profile than the 258 cam.
1980 AMC Spirit Restomod in Progress
SilverXJ wrote:Roller rockers won't help that mess you have created. Nor will God for that matter.
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