6.4 SRT cam into 5.7 eagle information
#2357916
08/22/17 12:32 AM
08/22/17 12:32 AM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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OP
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So I have changed plans several times on my truck motor and am currently building a new one for it just because I want some more power.
I am mentioning this here because there is a ton of bad and weird and just plain wrong info out there for this swap so figured I would clear the air on how it is going on mine.
For a little preface, I milled this block .020 to bump compression and quench, I figure it bumped compresion about 1/2 point.
Today I assembled the 5.7 short block with the 6.4 MDS cam and a dissasembled cam phaser and tested valve clearance both in full advance and full retard as well as 1/2 way between, on both intake and exhaust and found over .050 PTV clearance at all times, (I collapsed a lifter, shimmed the valves just barely closed then added .050 more shim and bolted the rocker shaft back down, rotated through many revolutions with no sighn of touching) may have been more but I stopped with that because that is all I care about, I am not spending $1000 on a cam and cam phaser limiter. So on a stock block there should be even more so I see no reason this could not be done in the truck, in a day and without removing the heads. The 5.7 spring might even work(I would at least buy new ones, they are under $60 from the dealer) or better yet just buy the 6.4 springs, they have a tiny bit higher spring pressure.
This might not be an awesome cam but I don't see how it can not be good especially when considering the cam cost me $68 and I needed a new cam anyhow. A lot of guys are saying you have to install the comp cams phazer limiter, that is grade A bologna.
Hopefully someday soon I will have an update how this thing runs. Probably gonna at least tough up the ports and VJ since I got the heads off anyhow. Hope this helps clear the air about this swap.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2357997
08/22/17 07:09 AM
08/22/17 07:09 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Trumbauersville PA
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I had the 6.4 SRT(MDS) cam in my 2014's stock 5.7 , no issues, stock springs , no tune just plug and played. Ran about the same off idle to 3k, from about 3k on Pulled like a banshee till 6k , never did get it tuned....should of but didn't. If you plan on going past 6k I would opt for the 6.4 springs. Just my $02 worth.
Last edited by ric3xrt; 08/22/17 07:11 AM.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: WO23Coronet]
#2358456
08/23/17 07:45 AM
08/23/17 07:45 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Worked fine, only thing I didn't like was with the 3.55 gears it seamed to lose some stoplight bottom grunt, with 3.92s-4.56s it would been great.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: Medlock51]
#2359001
08/24/17 09:05 AM
08/24/17 09:05 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Does anyone know if the later VVT blocks (6.1/6.2/6.4) can be machined to accept an '03-'08 cam without the cam phaser deal?
I'm initially going to build an early 5.7 w/carb (rules) for my dirt car but would like to see if there's a way I can finagle some extra cubes without going to a longer stroke than a 3.79... the hot set-up in these endurance deals seems to be a big bore/short stroke motor. Sonic test your 5.7 block, there are a few of them out there(03-04) that can go as large as the 4.055 Bore of the 6.1 hemi.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: RTSrunner]
#2359002
08/24/17 09:07 AM
08/24/17 09:07 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Like the 6.1 cam into a 5.7,probably needs to be installed a bit advanced. Thought about it, but didn't know what kind of clearance I had , I've rear a few places where the MDS cam in the 5.7 can be a bit tight in the stock position.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: MattW]
#2359012
08/24/17 09:42 AM
08/24/17 09:42 AM
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Joined: Jun 2005
Posts: 2,776 Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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2the cam is longer
Last edited by MattW; 08/24/17 09:42 AM.
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2359016
08/24/17 09:49 AM
08/24/17 09:49 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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I believe it can be done, just need some one to go 1st, I don't have a spare 09 up 5.7 block to sacrifice. or I would of milled it down to see.
MatW have you done anything with the LS ECU/PCM? Pm if you want.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2359021
08/24/17 10:09 AM
08/24/17 10:09 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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One of the guys who works for me, he and I built a 446 in 392 for his old mans 2014 Challenger , we used the Hemitronix kit because the old man wanted to run a Hughs cam, I tried to talk him in to milling the SRT392 block but he didn't want to be my test subject.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2360178
08/26/17 03:39 PM
08/26/17 03:39 PM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Used VVT stuff is starting to get into the used market, but there's still way more non vvt stuff, + after market timing sets.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2360272
08/26/17 07:29 PM
08/26/17 07:29 PM
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Joined: Jun 2016
Posts: 170 Wisconsin
Medlock51
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I'll have a chat with Mike Jones @ Jones Cams... not sure if he has done much with the Gen III stuff... I'll have to have a custom cam ground with specs that will favor my application...
The photos from MattW seem to show that it can be done. I do have a broken block to play with and a couple good machine shops within shouting distance.
Last edited by Medlock51; 08/28/17 11:35 PM.
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2418896
12/15/17 09:44 AM
12/15/17 09:44 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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Sure beats the $1000 plus you will spend on an aftermarket cam after you buy the incredibly over priced cam, the over priced phaser limiter, a tuner to keep the CEL off... With mods like he has the gains should be even more drastic. This truck barely seems noticably less TQ at low RPM power with a fat jump as the RPM goes up, no tuner or anything. It is still happy even loafing down the road @70mph under 2000rpm. Total agreement, My low end was noticeable when I had a load in the bed and I think that was because my truck has 3.55s in it. with the Higher ratio's I don't think it'll be as noticeable. and if you get a tune ....that will wake it up a LOT. I loved the cam swap and if I ever put a 5.7 back in the truck it will have the SRT cam in it. I tell any one who will listen if you have a VVT 5.7 put the 392 cam in it, you will not regret it.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2420814
12/19/17 03:45 AM
12/19/17 03:45 AM
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Joined: Nov 2003
Posts: 1,881 Pittsburgh,PA
RTSrunner
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Pittsburgh,PA
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Sure beats the $1000 plus you will spend on an aftermarket cam after you buy the incredibly over priced cam, the over priced phaser limiter, a tuner to keep the CEL off... With mods like he has the gains should be even more drastic. This truck barely seems noticably less TQ at low RPM power with a fat jump as the RPM goes up, no tuner or anything. It is still happy even loafing down the road @70mph under 2000rpm. Dave,Is this installed at factory specs using n OEM timing set? IE: no advancing of the cam timing for the smaller displacement engine? RT
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2421337
12/20/17 08:14 AM
12/20/17 08:14 AM
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Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
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When I did mine, I bought a new Phaser,chain lower sprocket, and tensioners, and gasket kit.......afterwards I found out I didn't need all those extras ..it is as simple as pull cam out replace cam, with the new chain I just lined up the marks, put it all back together , truck took 3 starts to idle, and honestly I was a sh!tIng bricks really thought I'd F'd up the whole thing, but on that 3rd start it idled , and WOOOOOOOOW WHOOOO the fun begain
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2424221
12/27/17 01:35 AM
12/27/17 01:35 AM
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Joined: Dec 2017
Posts: 24 Northern Colorado
EagleDuster
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Hi guys, this is my first post... I've been on ForABodiesOnly.com for years but just recently got a 2014 5.7 Hemi to swap into my '70 Duster at some point and I'm looking for all the info I can find. Lots to read through in these threads, I actually found this one earlier when I was looking at replacement cams. The engine I got had a cam lobe/lifter failure so it needs a new cam and lifters; initially I thought I'd have to pay out the @$$ for a Comp piece and the phaser-limiter but now I'm just gonna get a 6.4L SRT cam for a non-MDS car. New springs and pushrods too.
One question regarding tuning for the bigger cam, if I get the MP PCM and Harness kit with the unlocked PCM would I be able to tune it myself? Regardless I'm guessing having a custom tune from a modern Hemi specialist would get the best results?
Last edited by EagleDuster; 12/27/17 01:36 AM.
Khalid 1970 Plymouth Duster, 1993 Jeep Cherokee 4x4
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: EagleDuster]
#2424428
12/27/17 03:47 PM
12/27/17 03:47 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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I Live Here
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OP
I Live Here
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push rods are the same, no sense in changing them, the 5.7 springs you have will work, the 6.4 springs may be better, they use the same IH seat diameters and retainers so they drop right in. I did my swap without any tuning or the expensive 6.4 springs and its fine, a definte improvement with no other changes so if you can not change your tune you should still be in good shape. I used a MDS cam because I had already bought it for my 1/2 ton and its great, I doubt youd see 5 hp difference as the changes for MDS are super tiny, I have run MDS on a non MDS cam and it is fine that way also.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2424562
12/27/17 07:34 PM
12/27/17 07:34 PM
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Joined: Dec 2017
Posts: 24 Northern Colorado
EagleDuster
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Thanks Dave good to know... I'm leaning towards upgrading the springs because this engine will be hooked to a manual transmission and I want to be able to redline this baby and speed-shift without worrying about breaking a spring and dropping a valve. I also mentioned pushrods because the one that was on the failed lifter got bent, guess I can just replace that one and call it good, no use in replacing all of them as a "preventative" measure? This 5.7 has 135k miles on it btw...
Khalid 1970 Plymouth Duster, 1993 Jeep Cherokee 4x4
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Re: 6.4 SRT cam into 5.7 eagle information
[Re: HotRodDave]
#2426017
12/30/17 08:18 PM
12/30/17 08:18 PM
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Joined: Jan 2003
Posts: 888 Wooster, Ohio
kpzbee
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Wooster, Ohio
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Thanks for posting this swap. I read about this before when I was doing research for my 5.7 swap I'm now doing into my Javelin. After seeing this again and doing some more looking, I bought the non MDS cam with PSI springs and Manley retainers for it. For a street car that gets driven a lot I figured this is the best bang for the buck over a custom cam.
"It's funny how one project eventually leads (or forces) you into another one. It's really just one endless project designed to induce insanity and bankruptcy."
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