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Unread 10-03-2007, 12:38 PM   #1
stngh8r
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Join Date: Sep 2007
Location: Idabel, OK
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4.0 soup it up or fix it back stock?

Well, I am new to the board, but not new to wanting to add HP to everything I own.

I have several questions, but first let me tell you the situation. My wife's 92 XJ has recently blew a head gasket and she may have gotten it hot enough to warp the head, but dont know yet.

My thoughts are: This would be the perfect time to add a cam/headers/exhaust and possibly port the heads/TB and gasket match the intake. The cam I have theoretically chose is the new VooDoo 63500 (Duration @ .050 IN/EX: 208/213; Lift IN/EX: .484"/.484"; LSA / ICL: 112/108; RPM Range: 10005200 (w/ lifters)


My questions:

1. How do I ID a HO engine and/or head (her engine is from a salvage yard and not OE)? I have located the HO #s on the internet thanks to this website, but not yet figured out where these #s are located on the head? Are they visible without pulling off the valve cover?

2. If I change the cam, add headers, do a mild port to the heads and throttle body; Will the injectors and fuel pump be up to the task? Will the computer be up to the task? With electronics and fuel, what problems/solutions/complexity am I looking at?

Thank you in advance for your knowledgable replies

Eric<><

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Unread 10-09-2007, 01:36 PM   #2
stngh8r
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Last edited by stngh8r; 10-17-2007 at 10:09 AM..
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Unread 10-12-2007, 12:49 AM   #3
JEEPINWI
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The head ID number is located between the 3rd and 4th cylinder on the intake/exhaust side of the head. I'm not positive, but I think you can see the number with the valve cover attached.

The fuel system is still adequate with the mods you stated. If you're working on a pre-96 4.0, you can build a MAP sensor adjustor to fine tune your A/F mixture.

Now, where did you find that cam? I'd like to find out more about it.
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99 XJ Cherokee, 2 door, 4.6L Stroker, 5 speed, 4x4, 8.25" rear, 3.07 gears
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Unread 10-17-2007, 01:37 AM   #4
stngh8r
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Thank you for the info.

VooDoo offers several cam selections and the 63500 is the first step up from stock, but I was afraid that going any larger might cause problems with tuning.

http://www.holley.com/types/AMC%20L6...0Hydraulic.asp
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Unread 10-17-2007, 08:33 AM   #5
75SV1
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Here read:
http://www.jeep4.0performance.4mg.com/
Tom
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Unread 10-17-2007, 10:07 AM   #6
stngh8r
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That is where I originally found the casting #s for the head, but I never seemed to find a location on that website. Anyways, that is a great website. I even have it bookmarked, lots of good info on there.

Thanks

Eric
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Unread 10-17-2007, 10:44 AM   #7
75SV1
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Look under tech TECH SPECS.
Tom
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Unread 10-17-2007, 12:58 PM   #8
stngh8r
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-OK, will do. That is where I found the casting #s in the first place, but I must have missed the information concerning where to find the casting number on the head itself? I will look at the Tech Section again sometime.
-It seems for the time being that JEEPINWI has answered the question, so no sweat.

Thank you for the advice

Eric <><
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