Pentastar Heads on a 3.8 block? - Jeep Wrangler Forum

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Old 03-23-2012, 03:04 PM   #1
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Pentastar Heads on a 3.8 block?

I have been searching for into on how different these motors are. Anyone know if the block is completely different? Any idea on this build?

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Old 03-23-2012, 03:43 PM   #2
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Do a little more research on the pentastar, the cams have phasers. You will have no way to control cam timing.

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Old 03-23-2012, 04:00 PM   #3
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Good point, Chrysler is so slow to upgrade power plants. They wonder why everyone is always doing motor swaps. I guess it's just a supercharger or a swap from here. 3.8 sucks
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Old 04-02-2012, 04:19 AM   #4
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i've just bought a JK here in Oz,The car itself is awesome but totally under powered. I'm asking the same questian as you jaimeson55 regarding the differences in these two powerplants. our compresion is low @ 9.6:1 to start off with so i was thinking a Turbo,but which one, or a Vortech charger V3. I just don't know if i want to do that to the motor just yet
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Old 04-03-2012, 12:13 AM   #5
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I just ordered the RIPP vortech kit. I plan on tuning it for E85 and then stepping up to 60lb injectors and a 12psi pulley. I think that will about do it. I will let you know how the stock kit is. We need to get some good videos on youtube of the kit, everything up there is boring.
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Old 04-04-2012, 08:33 AM   #6
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Ripp has a few vids on you tube,the one that impressed me was the guy in the desert doing doughnuts around his mate.

just before you go & further modify the charger after the stock install,go check with a good motor builder cause i'm sure your going to need different valves & springs & decompress the engine alittle,that doesn't cost much in parts but the labour may hurt. 12 psi may take it up to around 17:1 comp ratio which means you could blow your heads & cost lots of dollars. I know with Turbo's,you cant leave the motor stock & double the comp ratio without head work & exhaust,just keep that in mind.
Maybe we can do a group buy cause i'm thinking of buying one.get it cheaper

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