"Finally" The New Heads and Intake - Cherokee SRT8 Forum
WK1 General Performance Discussion If you are planning on modifying your Jeep Grand Cherokee SRT8 with a performance enhancing modification, this is the section to post about it.

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post #1 of 22 (permalink) Old 03-11-2007, 11:35 PM Thread Starter
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"Finally" The New Heads and Intake

The very first set of highly modified cylinder heads and modified intake are being tested now on a Fla Magnum Vehicle. The power off idle is awesome right up to red line! 80 to 140 mph pulls are also real strong. The old AG Version TCM is hindering performance some but that will be changed to the latest version. These aren't a 6.1 head but a highly modified late model Mopar head. They are designed to enhance the factory tune by improving the port velocity off idle and right up to red line. No trouble codes from this change and this vehicle has only a 3" Cat back exhaust in addition to the heads. I actually saw these heads and intake at the designer's garage before they were shipped to Fla. The time slip will tell all? More Later. Gene
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post #2 of 22 (permalink) Old 03-11-2007, 11:54 PM
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Re: "Finally" The New Heads and Intake

Gene,
What's done to the intake, porting, shortening? What kind of tests will the customer perform? Both dyno and track?
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post #3 of 22 (permalink) Old 03-12-2007, 12:16 AM
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Re: "Finally" The New Heads and Intake

Good news, Gene. Please keep us posted...
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post #4 of 22 (permalink) Old 03-13-2007, 06:46 AM Thread Starter
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Re: "Finally" The New Heads and Intake

The intake is modified stock one and made to fit the head port. Runner lengths are about the same but highly modified to enhance Velocity but also Flow. The beauty of these are the stock headers flow enough to not hinder them at all, plus stock Cats. No CEL codes but just Gut Wrenching Power! Enhances DCX Tune! Also the stock PCM does work with these. Gene PS. The TCM also controls a lot of performance as it controls timing and when it happens, source; Star Scan!
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post #5 of 22 (permalink) Old 03-13-2007, 08:13 AM
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Re: "Finally" The New Heads and Intake

So, Slightly worked intake. The heads are a new cast? Rumor has it that a major manufacter is working on heads and intake. Gene, keep us up to date.

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post #6 of 22 (permalink) Old 03-14-2007, 12:23 AM Thread Starter
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Re: "Finally" The New Heads and Intake

I spoke today to Jim in Fla. and he is so far real happy with the performance gains but plans to test his Magnum at the strip soon. Traction is now a problem but I hear MT is coming out with 18" DR Tires in several widths that will help that, maybe? I'll post any furthur news and flow numbers as soon as possible. Gene
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post #7 of 22 (permalink) Old 03-14-2007, 04:57 AM
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Re: "Finally" The New Heads and Intake

Quote:
Originally Posted by SRTJeep
I spoke today to Jim in Fla. and he is so far real happy with the performance gains but plans to test his Magnum at the strip soon. Traction is now a problem but I hear MT is coming out with 18" DR Tires in several widths that will help that, maybe? I'll post any furthur news and flow numbers as soon as possible. Gene
I should have a set of drag radials within a week or so. The performance shop in Charlotte that will do my supercharger install is helping out with the drag radial / wheel combo since the vendors on our site could not help me. I will share the tire / wheel info as soon as they arrive for the trial install.
Bill
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post #8 of 22 (permalink) Old 03-17-2007, 11:20 PM Thread Starter
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Re: "Finally" The New Heads and Intake

The latest news is it revs to 6400 easy off idle, tires are blown away. The power band is awesome through-out the rpm band. A drag strip run is coming this week if possible. The heads are called "Pro-Stock Performance" and sold exclusively through the "FASTMAN" No down sides from these heads and intake just raw performance! Mickey Thompson will have their DR out in 18" size soon. I'll keep you posted. Gene
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post #9 of 22 (permalink) Old 03-18-2007, 10:44 AM
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Re: "Finally" The New Heads and Intake

BFG already makes a 18" DR, right??? ...or am I misunderstanding about the size that fits our GC's??
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post #10 of 22 (permalink) Old 03-18-2007, 10:46 AM
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Re: "Finally" The New Heads and Intake

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BFG already makes a 18" DR, right??? ...or am I misunderstanding about the size that fits our GC's??

So does Nitto fwiw.
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