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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #101  
Old 05-24-2012, 08:33 PM
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I was just getting ready to write that, but I think the hp gain was still after those mods
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  #102  
Old 05-24-2012, 09:50 PM
irnwkrkev irnwkrkev is offline
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Don't forget if going to a cam as large as the 274 you're going to need :

valve springs
stiffer pushrods
non-MDS lifters
MDS solenoid plugs

The 6.4 has different :

MDS lifters ($400 at a discount parts house)
Springs ($100+)

The 6.4 has the SAME:

timing chain
spring retainers and locks
pushrods
rocker arms

Anyone know if the head bolts are TTY (torque to yeild)? That would require new bolts.
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  #103  
Old 05-24-2012, 10:06 PM
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The cam goes in with no additional mods
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  #104  
Old 05-24-2012, 11:06 PM
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Would it even be safe to spin this motor to 6500+ with stock springs. It seems to me that like the 273 for the third gen's maybe the 274 isnt made for us quad cab guys
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  #105  
Old 05-24-2012, 11:55 PM
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Quote:
Originally Posted by irnwkrkev View Post
Don't forget if going to a cam as large as the 274 you're going to need :

valve springs
stiffer pushrods
non-MDS lifters
MDS solenoid plugs

The 6.4 has different :

MDS lifters ($400 at a discount parts house)
Springs ($100+)

The 6.4 has the SAME:

timing chain
spring retainers and locks
pushrods
rocker arms

Anyone know if the head bolts are TTY (torque to yeild)? That would require new bolts.
Why do you "need" non mds lifters? And the MDS plugs for these motors are a no no.... If one was to put this cam in a motor then they would have a diablo tuner which allows you to disable mds no need for plugs or new lifters...

One thing that you would also need is a cam phase limiter from comp cams. Without a cam phase limiter you will surely see piston to valve clearance issues!
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Last edited by RamTex; 05-25-2012 at 12:00 AM.
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  #106  
Old 05-25-2012, 12:25 AM
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The 266 cam sounds like money for trucks! I am still wanting the 6.4 cam.....60 bucks vs 811!
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  #107  
Old 05-25-2012, 06:18 AM
irnwkrkev irnwkrkev is offline
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In the ls world the lifter for the auto cars can not take the spring pressures needed to control the valvetrain of most aftermarket cams. It is necessary to swap in non-DOD (gm's MDS) lifters. The high spring pressures can cause the lifters to colapse.

Check out the specs for a stock cam and the 6.4 cam.
Quote:
sprintertech
6.4 with mds......

Total duration....
Intake 286 open@36*btdc/closes@250*atdc
exhaust 288 open@278*btdc/closes@10*atdc
46 deg overlap
lift@valve w/0lash
intake .577
exhaust .537


09+ truck 5.7 with mds

total duration
intake 268....opens@28.2*/closes@239.8*
exhaust 290....opens@274.2*/closes@15.8*
44*overlap
lift@valve w/0lash
intake .472
exhaust .460

.105" more lift on the intake and .067" more lift on the exhaust with the 6.4 vs 5.7. I'd like to know how much "cushion" there is untill spring bind with the stock cam. Another question is the amount of lift a 5.7 MDS lifter can take and still be functional. .105" is a lot of lift!

Maybe the 6.4 cam can be used with MDS shut off with the stock MDS lifters. But why use an MDS cam then?

Obviously by the different part #'s Dodge felt that to run the 6.4 cam they needed new lifters and springs. Seems to me they re-used as much as they could, since all the other parts I listed have the same part #'s.

The comp VVT cams are designed to retain VVT, not MDS. That is why I mentioned solenoid plugs and standart lifter swaps. If you think you'd be able to use the stock springs with the 274 cam you're crazy!

Last edited by irnwkrkev; 05-25-2012 at 06:28 AM.
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  #108  
Old 05-25-2012, 08:49 AM
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The stock 6.4 has MDS and the same valve springs. I would probably put beehive springs in just to be safe, but as far as Comp goes, it's not necessary.
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  #109  
Old 05-25-2012, 02:38 PM
irnwkrkev irnwkrkev is offline
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I'd like to know WHERE you found out that the 6.4 and 5.7 use the same springs. I've searched through factory parts dealers websites and they are listed with different factory part numbers.

The comp cams have more lift then then the 6.4 cam so how would they not require different springs? A spring for .470" lift is certainly NOT going to work with .6++" lift!

I swapped a ls9 cam in my ls3 camaro because it was non-dod, non-vvt, and similar in lift to the stock ls3 cam....just a little bit more duration. It was good for 20hp. The car only had 800 miles on it and didn't even require gaskets.

If you try put a comp .6++ lift cam with stock lifters (w/out tuning out mds) and stock springs you will surely toast your motor! I'd like you to even find a mechanic who will tell you they'll do it for you. You obviously can't do it yourself or you would know better!

Last edited by irnwkrkev; 05-25-2012 at 03:37 PM.
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  #110  
Old 05-25-2012, 04:04 PM
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916Timmy 916Timmy is offline
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Thats how HHP did it, and if they say it's cool and Comp says its cool, then it probably is Done arguing!
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