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  1. #1
    Join Date
    Oct 2016
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    6.1 heads on a 5.7

    Hey, i have a pre eagle 5.7 and im planning on putting the 6.1 heads on. I have done research and know what all i need. I was wondering if any of yall in here have done it. If so could you tell me what power you gained out of it, how bad the fuel mileage dropped, was there any noticable diffrence? Ive been looking and many talk about it but noone posts their results. Also. For the heads, will the 5.7 valve cover and rocker arms work on the 6.1 heads? Ive got springs and rods but need to know about the rest. Any help is appreciated, thanks.

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  2. #2
    Join Date
    Jan 2016
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    I think the stock preeagle heads are 85cc- 6.1 are smaller but larger than Eagle which are 65cc- So you should get a bump in compression. Might be good time to cam it also.

  3. #3
    Join Date
    Jan 2016
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    Early 5.7 covers will work as late 57 are taller valve train. Rockers the same.
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  4. #4
    Join Date
    May 2018
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    I tried to post here with little results as well. As of now I have a 2006 pre eagle charger. I have
    fully assembled 6.1 heads
    6.1 intake with all sensors and pcv valve
    6.1 headers, mids, catback
    6.1 Injectors (may or may not use them)
    6.1 pushrods
    6.1 lifters to toss MDS
    6.1 intake gaskets
    6.1 exhaust gaskets
    5.7 3.950" bore cometic head gaskets. .051 thick to bring compression from 11:1 down to 10:4-6 so you can run 91-93 octane

    And diablotoona/johan can email tune you but I'm going to try and run it with my superchip programmer before I have to buy a Diablo. His tunes are 200-700 depending.
    And as far as mileage and power. Looking at 20-40 hp off the compression jump and intake. Plus you will make power after 5500rpm.


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  5. #5
    Join Date
    Oct 2016
    Posts
    59
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    So my current build befor heads. I have 6.1 cam with supporting mods, custom tune, headers, mids, and a 3in cat back, cai, 180 tstat, egr delete, and srt hood for cooling purposes. I know im need ticker gaskets but thitek makes the ones i need. I also have a 6.1 intake manifold to go on with the heads.

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  6. #6
    Join Date
    Oct 2016
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    Quote Originally Posted by [email protected] View Post
    I tried to post here with little results as well. As of now I have a 2006 pre eagle charger. I have
    fully assembled 6.1 heads
    6.1 intake with all sensors and pcv valve
    6.1 headers, mids, catback
    6.1 Injectors (may or may not use them)
    6.1 pushrods
    6.1 lifters to toss MDS
    6.1 intake gaskets
    6.1 exhaust gaskets
    5.7 3.950" bore cometic head gaskets. .051 thick to bring compression from 11:1 down to 10:4-6 so you can run 91-93 octane

    And diablotoona/johan can email tune you but I'm going to try and run it with my superchip programmer before I have to buy a Diablo. His tunes are 200-700 depending.
    And as far as mileage and power. Looking at 20-40 hp off the compression jump and intake. Plus you will make power after 5500rpm.


    Sent from my XT1585 using Tapatalk
    Are all these mods installed? If so how bad did your mpg drop?

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  7. #7
    Join Date
    Mar 2009
    Location
    France
    Posts
    184
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    I would like to add questions

    I'll do this mod as I've complete 6.1 in a box and a complete (lol) 300c wagon AWD 5.7 (french version) in the same Garage

    I think precedent post list all materials needed as I found in numerous topic on head Swap

    My question is for RPM

    How many RPM could handle the stock cranckshaft and pistons with a total 6.1 head Swap including springs, pushrod, and cam properly choose for daily use or daily race
    Hemi pushed to 6500rpm sound like hell and give a lot or power

    How many RPM thé stock rotary could handle ?
    How many WHP do the full rotary remplacement and bore ?
    Is thé complete job worse the WHP ?

    As the headswap is easy , the complete job take many more time and tools

    What's your feeling ?

    Envoyé de mon T3 en utilisant Tapatalk

  8. #8
    Join Date
    Jun 2012
    Location
    D/FW, Tx
    Posts
    499
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    Once you replace the valve springs with SRT you can raise the shift points to 6,400 RPM and rev limiter to 6,700 RPM.
    The 6.1 SRT exhaust is totally different then the 5.7 from the exhaust manifolds to the tailpipes.
    My 5.7 with big valve 5.7 heads, shorty headers, and cam is about 400 RWHP. You should be a little less than that.
    BTW factory RWHP is about 270 for a 5.7
    You will need a tuner and an aftermarket tune to make it run right.
    2005 Dodge Magnum RT.
    12/2016 - Inertia big valve heads, Eagle intake, non-MDS lifters, Spartan Plus cam, Shorty headers. 390 RWHP, 390 RWTQ. (Work by Inertia)
    01/2017 - Bilstein shocks, SLP 25% underdrive pulley. s/b 400 RWHP, 400 RWTQ now. (Work by me)
    10/2017 - Replaced engine mounts with 392SRT manual transmission, added police oil cooler, additional PS and Trans coolers, Mishimoto radiator. (Work by me)
    10/2017 - Replaced Torque Converter with FTI 3,000RPM, Installed 3.73:1 Getrag kit. (Work by True Street Motorsports)
    11/2017 - Wilwood brakes with 15" front brakes. (Work by me)

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