Maryland Cherokee Club
CF Veteran
Joined: Feb 2012
Posts: 2,574
Likes: 0
From: Laurel, MD
Year: 1998
Model: Cherokee
Engine: 4.0L
CF Veteran
Joined: Dec 2010
Posts: 6,880
Likes: 0
From: Frederick, Maryland
Year: 1996
Model: Cherokee
Engine: 4.0 I-6 High output
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
Last day of actual classes today. Then 2 finals tuesday and one on Thursday.
Then it's summer vacation. Decided to only take one class over the summer instead of 3.
Then it's summer vacation. Decided to only take one class over the summer instead of 3.
CF Veteran
Joined: Feb 2012
Posts: 2,961
Likes: 0
From: Sykesville, Md
Year: 2000
Model: Cherokee
Engine: 4.0
Considering a topend job for my 4.0. Can I run a 7120 head on my '00? Trying to get rid of the 0331 and read that the 7120s have the best flow and still maintain the coolant temp provision.
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
main issue is coil pack attachment (no way to attach on the 7120), but you can fab a bracket to hold those easy.
http://www.naxja.org/forum/showthread.php?t=937214
You'll also need to swap the exhaust manifold or adapt yours to fit the ports.
You can use a 0630 also, same exact head as the 7120 but with a boss for the coolant sensor in the head (just block off). On your 2000 there should only be a coolant temp sensor in the thermostat housing.
http://www.naxja.org/forum/showthread.php?t=937214
You'll also need to swap the exhaust manifold or adapt yours to fit the ports.
You can use a 0630 also, same exact head as the 7120 but with a boss for the coolant sensor in the head (just block off). On your 2000 there should only be a coolant temp sensor in the thermostat housing.
Last edited by dukie564; Apr 24, 2014 at 09:33 AM.
CF Veteran
Joined: Feb 2012
Posts: 2,961
Likes: 0
From: Sykesville, Md
Year: 2000
Model: Cherokee
Engine: 4.0
main issue is coil pack attachment (no way to attach on the 7120), but you can fab a bracket to hold those easy.
http://www.naxja.org/forum/showthread.php?t=937214
You'll also need to swap the exhaust manifold or adapt yours to fit the ports.
You can use a 0630 also, same exact head as the 7120 but with a boss for the coolant sensor in the head (just block off). On your 2000 there should only be a coolant temp sensor in the thermostat housing.
http://www.naxja.org/forum/showthread.php?t=937214
You'll also need to swap the exhaust manifold or adapt yours to fit the ports.
You can use a 0630 also, same exact head as the 7120 but with a boss for the coolant sensor in the head (just block off). On your 2000 there should only be a coolant temp sensor in the thermostat housing.
Take a look at this
Stock cam specs
Advertised duration int./exh.: 253/259 deg
Duration @ 0.050" lift int./exh.: 188/192 deg
Valve lift int./exh.: 0.408"/0.414"
What I am considering running
- Advertised Duration (Int/Exh): 262/268
- Duration @ .050 (Int/Exh): 220/226
- Valve Lift (Int/Exh): .507/.527
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
Thanks once again for the sharing of knowledge duke.
Take a look at this
Stock cam specs
Advertised duration int./exh.: 253/259 deg
Duration @ 0.050" lift int./exh.: 188/192 deg
Valve lift int./exh.: 0.408"/0.414"
What I am considering running
Take a look at this
Stock cam specs
Advertised duration int./exh.: 253/259 deg
Duration @ 0.050" lift int./exh.: 188/192 deg
Valve lift int./exh.: 0.408"/0.414"
What I am considering running
- Advertised Duration (Int/Exh): 262/268
- Duration @ .050 (Int/Exh): 220/226
- Valve Lift (Int/Exh): .507/.527
CF Veteran
Joined: Feb 2012
Posts: 2,961
Likes: 0
From: Sykesville, Md
Year: 2000
Model: Cherokee
Engine: 4.0
Port and polish the new head, gasket match the manifolds, cowl intake, roller rockers, heavier weight springs, moly pushrods and the cam/fresh bearings. Should see about 40-55 more horses and about the same in ft/lbs
CF Veteran
Joined: Feb 2012
Posts: 2,961
Likes: 0
From: Sykesville, Md
Year: 2000
Model: Cherokee
Engine: 4.0
All about the flow broseph..... The head and manifolds currently on the 4.0 are designed for quick warm up for optimum emissions reduction. They do that by creating turbulence in the runners and ports. Already have a higher flowing exhaust system aside from the exhaust mani. If I am taking the head off I mind as well replace it with a header. Then I dont have to worry about the head or the stock mani cracking 