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06-07-2007, 02:23 PM
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#1
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Registered User
Join Date: May 2007
Location: Las Vegas
Posts: 247
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K, I want to do some performance mods on my 91 Laredo. This is my idea: Go to the pic-a-part here in town, find a 4.0L head and take it to the local machine shop. There, have them port and polish the intake and exhaust ports, polish the bowls and deck the mating surface on the bottom of the head. Also, i was gonna have them install all new seals, springs, retainers, all vlaves, and give it an angle job. I was then gonna install this on my Jeep. Has any one done this and if so, what advice can they give me. Thanks
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06-07-2007, 02:52 PM
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#2
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Registered User
Join Date: Jan 2006
Location: Hamilton, NJ
Posts: 2,127
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i can give you some advise...do it yourself. if you're competent enough to correctly remove the head, you can invest a hundred bucks in a dremel and other tools. take a little off at a time, keep it smooth and steady, use a sharpie to watch what you're taking off, and soon you'll have a max ported head...
probably worth another 50 or so horsepower and torque...maybe
you'd be better off putting in a new cam and new springs on top of the stock vales over all the machine work necessary. a cam is only 200 bucks, new springs are about 60, a new timing chain is about a hundred bucks for a good one...
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1994 jeep cherokee, xj, 3" rough country springs / bilstein 5100's, 31" tires with trimmed fenders, aussie locked front diff, herculined ext, hella FF75 driving lights on factory fog location
[COLOR="Lime"]soon to be[/COLOR] 4.11 gear and and a ford 8.8 LSD rear and herc'd interior
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06-07-2007, 03:00 PM
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#3
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Registered User
Join Date: Dec 2005
Location: Jacksonville, Florida
Posts: 7,071
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what about putting in some bigger valves at the same time?
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1999 Cherokee Classic: R.I.P. http://www.cardomain.com/ride/2313036
2001 Cherokee Limited My Build Thread: 6" IRO Long Arms and coils, JKS ACOS, IRO 5.5" Leaf Springs, Liquid Iron Industries Slider Boxes, 35x12.50 Goodyear MTR/K, RC Quick Discos, Fox 2.0 IPF Shocks, Rear Disk Brakes, WJ Brakes and steering, JCR Rock Sliders, 60mm Bored TB, Cobra Injectors, Rugged Ridge Header, 2.5" Exhaust with Borla Muffler
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06-07-2007, 03:07 PM
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#4
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Registered User
Join Date: Aug 2006
Location: Oklahoma City, OK
Posts: 486
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A good shop should be able to put in some bigger valve and gasket match the head for a reasonable price.
Couple that with an aftermarket exhaust, 99+ intake manifold, bored tb, a nice header, and a high flow air cleaner setup and you should see some nice gains.
Power gains are directly proportional to money spent. 
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06-07-2007, 04:16 PM
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#5
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Registered User
Join Date: May 2007
Location: Las Vegas
Posts: 247
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Well, would be taking a casting and having all that work (valves, springs, seals, and retainers + port and Polish and polishing the bowls, and an angle job) be worth it if I dont have the time right now to pull the cam and stuff. I have enough experince to swap heads and time. The one hang up is that I dont have the time to do the polishing myself, but i do have time to do the swap...
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Cylinder Head..
