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Custom Dodge Ram Performance Mods - Engine - 6.4 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 6.4-liter HEMI® V8 engine - 410 horsepower, 429 lb-ft of torque.


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  #21  
Old 04-12-2014, 01:11 AM
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The heads aren't Apache heads in the truck 392 are they?
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  #22  
Old 04-12-2014, 10:18 AM
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Quote:
Originally Posted by Thunderhorse View Post
The heads aren't Apache heads in the truck 392 are they?
No don't think they are
The Eagle heads are a way better fit for the application anyway
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  #23  
Old 04-12-2014, 02:17 PM
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Originally Posted by Swaggerville Ram View Post
No don't think they are
The Eagle heads are a way better fit for the application anyway
Could you explain why please? I don't know too much about engines.
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  #24  
Old 04-13-2014, 10:26 AM
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Eagle heads have a smaller port cross section, so they will have a higher low lift and low rpm velocity than the apache heads. The trade off is that they become restrictive at higher rpm compared to the apache heads. High rpm performance is less of a concern on HD trucks than low rpm.
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  #25  
Old 04-13-2014, 10:32 AM
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If you build a bigger displacement engine, the Apache's will be better for feeding that. A stock displacement 5.7 (3rd gen) will benefit greatly from upgrading to an Eagle head (something I'vebeen thinking about doingot my Charger).
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  #26  
Old 04-13-2014, 11:36 AM
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No
You hook 15000lb trailer behind them I bet the apache version would feel real lethargic compared to the eagle headed version off idle/low rpm
Bigger is not always bigger for cylinder heads.
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Last edited by Swaggerville Ram; 04-13-2014 at 11:39 AM.
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  #27  
Old 08-20-2014, 08:39 AM
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Well after getting my truck dynoed I'm not as impressed as I wanted to be, with no mods it made 303hp/365tq at 4500 rpm from there it was falling fast, and shut down at 105mph, that's a 107 HP loss, now torque held pretty good to 5200 rpm, then I put the Trinity on with the 93 tune, numbers didn't change at all but speed limiter shut off so I did stay in it and it went 158mph at 6200 rpm, this was done in 4th gear as close to 1 to 1 as possible, the trinity offered no dyno mode. So I had to start at 3200 and ease into the throttle so it wouldn't down shift. So it may have gave up a few no. there.
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Last edited by Chuck466; 08-20-2014 at 09:32 AM.
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  #28  
Old 08-31-2014, 10:46 PM
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I got the 6.4 so I could interchange top ends with my SRT Challenger. I will be pulling down the 392 on the truck and likely replacing it with an Arrington forged 392. The biggest difference I have seen so far between the two is that the truck seems suffocated with limited air in and out. I've only had the truck a week and have not had the time to really get under the hood yet. In a few months, I should know the truck 392 like the back of my hand. It looks like I will need to move the engine/transmission forward to really play with the top end.

The SRT now has a fully forged Arrington 426 with Billet mains and Thitek heads. The Magnacharger from the SRT will likely end up on the truck sooner than later. There is a lot of work to do on the truck to get it breathing. Should be a fun project to get to know RAM.
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  #29  
Old 08-31-2014, 11:11 PM
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Quote:
Originally Posted by Badunit View Post
Here is some information of the 6.4L Hemi in the Ram:

https://dl.dropboxusercontent.com/u/...Technology.pdf

Very handy pdf. Thanks. Interesting read.
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