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  #37  
Old 06-07-2010, 07:20 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

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Originally Posted by 1BAMFR View Post
I think there is 3 different levels of modding these Jeeps...I'll give you my opinion because I've done or am in the process of doing all of these mods........

Level 1- CAI, Headers, Exhaust, Thermostat, Tune
(Low maintenance and very reliable)

Level 2- Heads, Cam, Forced Induction, Nitrous
(Still kinda low maintenance but need to watch several things)

Level 3- Stroker, Tranny, Transfer Case, Rear Diff., Fuel System
(High Maintenance, Not very friendly as a daily driver sometimes,Lots of $$$ involved, Lots of down time and patience. Also dealing with finding the weak links in your build and constantly fixing things that break)

It's tuff to decide where you want to fall with your build but the deeper you go into the Jeep ..The deeper you'll be reaching for $$$,and it gets frustrating sometimes.

BUT...It will "payoff" in the end.....
The Srt Ocho is at level 2.5 as of right now, Built 392, so far the trans is holding up well, and it is my wifes DD, So far maintenence has been a non issue, just dialing in Johan's tune, but tha has been as much fun as it has been work. I am guessing the trans will need some help in the next year, and I personally think the TC will be fine stock. I'm trying to get Wavetech to do a diff for our rear axle. That with some good 1 piece axles and I think the drivetrain will be set, We'll see.
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  #38  
Old 06-28-2010, 08:40 AM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

If your gonna spend all that money, why not have the looks and performance already there? Buy the new SRT8 in 2012!
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  #39  
Old 06-28-2010, 12:58 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

Im more of the "built...not bought" kinda guy......
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  #40  
Old 06-28-2010, 03:28 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

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Originally Posted by Escape View Post
Agreed! If you want to go that big get the real deal.

I wouldn't go any bigger than a 392 on our current small blocks as your going to start to run into geometry problems on the crank/rod - axis/angle and thermal stress due to thin sidewalls.

We have not seen any signs of the problems mentioned above. You would be very surprised at the bore size in my 426.
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  #41  
Old 06-28-2010, 04:01 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

From what I've read/heard...there aren't any cams available for the new VVT HEMI's. Well, there aren't any cams that are worth the money (in regards to gains) to put in there. If you want to go the non-VVT route in a VVT engine, you need to replace th cam gear and reflash the PCM to a non-vvt version to be able to tune it.
That being said, and going with what I stated is true, flash the PCM and throw a new block in there and go fo it.
From my personal knowledge base:
High boost: 392 (more material around the cylinders)
Low boost or strong NA: 426
NA only: 440
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  #42  
Old 06-28-2010, 04:51 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

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Originally Posted by ekaz View Post
From what I've read/heard...there aren't any cams available for the new VVT HEMI's. Well, there aren't any cams that are worth the money (in regards to gains) to put in there. If you want to go the non-VVT route in a VVT engine, you need to replace th cam gear and reflash the PCM to a non-vvt version to be able to tune it.
That being said, and going with what I stated is true, flash the PCM and throw a new block in there and go fo it.
From my personal knowledge base:
High boost: 392 (more material around the cylinders)
Low boost or strong NA: 426
NA only: 440
You are mostly right, except for the reasoning of the 392 being better for high boost. Most rebuilds include an overbore, so that is a moot point between the 392/426/440. The Big advantage of the 392 is better bottom end geometry, they run longer connecting rods and a shorter stroke than the 426/440 so they have a better rod ratio and help the pistons from trying to drive themselves sideways out of the thrust side of the cylinder wall. The 392 should theoretically be more durable as far as longevity is concerned as well.
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  #43  
Old 06-28-2010, 06:11 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

if you get a true 440 and moderize it you can boost it all you want.
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  #44  
Old 06-28-2010, 06:27 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

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Originally Posted by scjeep4.7HO View Post
if you get a true 440 and moderize it you can boost it all you want.

The problem with the "true" 440 is finding a head that will flow anywhere near what a ported 6.1 head flows. I'd take a boosted 392 stroker over a boosted RB 440 any day.
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  #45  
Old 06-28-2010, 06:30 PM
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Re: Step in...lets discuss the 426 and 440 Hemi's!!!

I seen an RV 440 with low boost make almost 900HP to the wheels. Now tell me about head flow man!!!! And no it did not have stock heads.
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