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Discussion Starter #1
Okay I was really looking forward to selling my R/T and getting an SRT8 but as I read more and more about what other R/T owners are doing with there 5.7s it seems like I might as well stick it out with my 5.7 instead of spending all that money changing cars.

Now I read an article about aftermarket heads and what mostly caught my attention is how they are I guess milled down so that you can slap them on a 5.7 block and obtain 6.1 compression. So if I get aftermarket heads that are milled which will give my R/T 6.1 compression and then if I get "at least" an SRT8 stock cam (I would obviously go with a more agressive cam) would I then have SRT8 Hp/Tq numbers?

The only major differneces that I know of and please correct me if I am wrong are a bigger cam, higher comp due to pistons, better flowing intake manifold and heads right?
 

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there are alot of options u have...Franks Racing, PPP, or HHP.com are doing some great things w/ the 5.7

As for myself i have the whole JBA package (headers, high flow cats, catback) the flashpaq and getting ready to have the Franks Racing 'sidewinder' cam w/ 6.1 springs installed. Faster than a stock SRT-8!!! if u just want SRT-8 power this is the way to go...JBA, flashpaq (raised shift points) & a sidewinder. Now u add in ported heads w/ all the goodies and milled heads, B&G tune, & a more agressive cam were talking 400+rwhp all motor baby!!! Get w/ those guys & they can hook u up :D

HHP.com just released their stage 3 kit kinda of expensive but ur 5.7 will run like a raped ape! that stage 3 kit will eat up modded SRT-8's for lunch! no offense SRT guys. :D
 

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You may have to include headers and a full exhaust to that list. This would put you in the "neighborhood" of a stock SRT8. Think of what you can do to an SRT-8 for mods:)

I see that you already have the exhaust so the heads and cam should work to put up in SRT-8 teritory.

Todd
 

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does the 6.1 use the same block as the 5.7?
 

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Sorry, thats what i meant headers, cats, full exhaust, flashpaq, sidewinder w/6.1 springs = SRT8 power
i might save up a little more and get the heads too. no sense in doing cam only saves u some $$$ on install costs.
many of the 5.7 guys over @ LXforum have this same set-up & are very pleased
 

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my birthday is in 1 month. between gift money and more 2 more paychecks ill easy have surplus cash for:

jba full package(headers/high flow cats/catback)
flashpaq
cai

im gonna see where that sets me and decide if i need to spend more money to be satisfied. if im not the cam will more than likely be next hehe.

thats just me tho
 

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Discussion Starter #7
You may have to include headers and a full exhaust to that list. This would put you in the "neighborhood" of a stock SRT8. Think of what you can do to an SRT-8 for mods:)

I see that you already have the exhaust so the heads and cam should work to put up in SRT-8 teritory.

Todd
No see you don't understand Major diff between the two are the higher compression and the more agressive cam thats really it! Sure there are other things such as bigger injectors and better flowing intake manifold but thats it. Think about it getting a milled and port head and a more agressive cam will give you more HP/TQ theres no if ands or butts about it.
 

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i hear raped apes are really fast!
 

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I believe so I Think the only difference is the high comp pistons is all.
No...this isn't correct. Though similar in a number of ways, they are different blocks. The biggest difference is the heavier journals that the main bearings set in. There's a big long story on this in one of the late 05 Hot Rod mags....good article, worth looking up and reading.
 

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Discussion Starter #12
Yeah maybe the bearings but that dosen't give more horsepower, more reliability but thats it of course the 6.1 block is a little stronger but its nothing that can't be added to the 5.7s.
 

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Discussion Starter #13
Ok here we go again, in my situation I was planning on changing my R/T to an SRT8 I might as well dump money into my current motor. I will end up spending less money and make more horsepower as opposed to switching cars.
 

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Discussion Starter #15
you are forgetting about other upgrades...like better brakes/rotors with all that power.
Um yeah but I am talking about power, there is a vendor here selling a package deal heads, your choice or cam, and diablo tuner for about $3,000. If I trade my charger in I will at least lose that much if not more, not to mention I will be paying the tax, license and registration fees over again which in CA is about 10% of the vehicles cost. Also I currently owe about $24,000 the cheapest SRT8 that I have seen in my area was $35,000 I will be paying $11,000 more then what I currently owe! This is my situation.

Summary - Est
Trade in Loss - $4,000
Vehicle Price Diff- $11,000
Tax, Lic, Reg on $35,000 vehicle - $3,500

Total - Est $18,500

So how much are used Brembo's ($1,400)
 

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You're forgetting .4 liters of displacement...
 

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What makes the SRT version different

The SRT version produces another 85 horsepower and 30 lb-ft of torque than the 5.7 liter Hemi, and only some of that comes from the extra .4 liters of displacement. The Hemi produces more power per liter than any past Chrysler V8, including the 1966 Street Hemi, though with the technology available today, that's not surprising. Changes to the 5.7 include:
  • The basic, deep-skirted engine block structure was redesigned with reinforced bulkheads to handle higher loads.
  • To get more air in and out of the cylinders, SRT engineers bored out the diameter of each cylinder by approximately 3.5 millimeters in order to increase the total displacement from 5.7 liters to 6.1 liters. Cylinders are honed with torque plates to ensure a truer bore, to reduce friction and increase power.
  • Oil squirters, aimed at the underside of each piston, are added to aid piston cooling for engine durability. A special oil pump pressure relief valve is added to accommodate the squirter oil flow.
  • The oil pan and windage tray are modified to manage oil return to the pan sump at high engine speeds and improve power.
  • Larger-diameter, flat-top pistons with high-load capability are specified to handle the SRT 6.1-liter HEMI’s compression ratio, which was increased to 10.3:1 from 9.6:1. Connecting rods are redesigned and make use of higher-strength powder metal material. New floating piston pins are introduced to handle higher loads.
  • The SRT 6.1-liter HEMI’s crankshaft is forged from micro-alloy steel and rotates in tri-metal main bearings for high-load capability. The crankshaft damper is retuned for higher engine speeds.
  • The SRT 6.1-liter HEMI features cylinder head ports designed with larger cross-sectional area. This allows 11 percent higher flow in the intake ports, and 13 percent higher flow in the exhaust ports.
  • A billet steel, high-strength camshaft features more overlap and lift for better performance.
  • Intake valves feature hollow stems and 2 mm larger heads compared to the 5.7L engine, allowing more air flow. The hollow exhaust valve stems are filled with sodium to dissipate heat efficiently. Premium valve springs with external dampers enhance the SRT 6.1-liter HEMI’s valvetrain and enable higher engine speed operation to 6,400 rpm. The valvetrain system enhancements allow the peak output engine speed to increase to 6,000 rpm from 5,000 rpm — a 20 percent increase.
  • Engine breathing is improved with specially designed intake and exhaust manifolds.
  • The cast aluminum intake manifold is designed with shorter, larger-diameter and tapered runners for high-speed tuning. Internal runners are core-dipped to smooth the runner finish and improve air flow.
  • Fuel injector flow capacity is also increased by 14 percent over the 5.7-liter engine. Electronic throttle control is shared with the 5.7-liter HEMI, but breathes through a revised high-flow air cleaner box outfitted with a tuned resonator delivering a deep performance sound character (and good for an extra eight horsepower).
  • Exhaust headers on the SRT 6.1-liter HEMI are individual tubes encased in a stainless steel shell. Exhaust runners allow increased gas flow while maintaining fast catalyst light-off, while adding 12 horsepower over the 5.7-liter engine’s cast manifolds.
  • To control the combustion process, SRT engineers fine-tuned the engine management system using dual knock sensors with premium fuel.
So why aren't these items used in the stock Hemi? Well, in some cases, they demand premium fuel, a tradeoff many drivers aren't willing to make - 340 horses move nicely, and many won't spend an extra 20 cents a gallon for another 20 or so horses that will be hard for most people to feel. In other cases, it's gas mileage - the 6.1 is a performance motor and gas mileage was not the primary concern. In most cases, though, it's a matter of money; the standard Hemi does an incredible job of producing high power at low cost, especially compared with, say, similarly powered Volkswagen or Mercedes V8s.
 

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Discussion Starter #19
Ok SRT Ceaze what manual or website did you read this from? Yes, yes, yes, in a nut shell the block is stronger but nothing that we can't install in the 5.7 right. Bigger bore, higher comp pistons, but like I said before, this can be achieved by a milled head milled=6.1 compression, thats the end of that, and the milled head will already be ported so it will flow better than SRT. Headers ummm lets see buy aftermarket which will flow much better than any stock charger headers. As for the crankshaft I would assume that the crank stock can handle at least 500 hp so there is no issue here. Aftermarket injectors should if they haven't already come out.
 

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the website is allpar.com, pretty imformative. I don't think the 5.7 has oil squirters and a oil sump system.
 
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