New Hemi Swap data

[Darius]

Every one of your questions is already answered in my build thread. Including after build performance and how much I LOVE IT!!!!!!
https://www.forbbodiesonly.com/moparforum/threads/b-body-stiffening.1121/
It may take a minute to read through but there is a LOT of info in the build with more in depth questions answered supported by pics. The synopsis you are asking for is fine but still isn't enough to make the decision to take on a project like this......unless you are like me and like figuring it all out on your own.

 

[70chall440]

I hear what you are saying, however if you are someone thinking about this swap and coming from a place where you really don't know what you don't know, it is very confusing to try and read multiple build threads bc each build is unique. I was/am trying to get something that a person could look through and get an idea of which year/model engine meets their needs, issues surrounding it etc. in a short concise manner. Yes, I get that this bullet point list does not completely capture the entire swap or the challenges with it, but it would provide some trends, common items, etc. People could look at specific models such as the 6.1 or 6.4 vs the 5.7, which ECM/PCM seems to be the most used, common obstacles, etc.

A single build thread focuses on a specific car, engine, builder whereas something like this list captures multiple builds in one thread. I should have added a bullet point for the link to a build thread so that people could post that; I will edit it.

 

[70chall440]

Guess I cannot edit the original post so I am adding it here;

• Car new hemi was put in (make, model, year):
• New gen hemi size:
• New gen hemi year:
• What did the new gen hemi come out of or was designed for (car/truck):
• Carb or EFI (type, brand, etc):
• What intake was used:
• What exhaust manifolds/headers were used:
• Modifications made to the new gen hemi:
• Type ignition used:
• What PCM was used:
• What harness was used:
• What front serpentine system was used:
• What alternator was used:
• What PS pump was used:
• What motor mounts were used:
• Transmission used behind hemi:
• If manual, what clutch was used:
• What transmission mount was used:
• What adapters were needed to get the trans to mate/work:
• What modifications were required to the car to make the hemi fit/work:
• Biggest challenge/problem encountered and how it was resolved or overcome:
• What would you have done differently:
• How do you like it:
• Link to your build thread:

 

[jgmccrac]

• Car new hemi was put in (make, model, year): 1969 Charger
• New gen hemi size: 6.1
• New gen hemi year: 2008
• What did the new gen hemi come out of or was designed for (car/truck): Challenger
• Carb or EFI (type, brand, etc): EFI
• What intake was used: Stock
• What exhaust manifolds/headers were used: TTI
• Modifications made to the new gen hemi: None
• Type ignition used: Stock
• What PCM was used: Holley Dominator
• What harness was used: Holley
• What front serpentine system was used: Stock
• What alternator was used: Hemi 2005 unit with mopar adjustable voltage regulator
• What PS pump was used: Stock
• What motor mounts were used: Shumacher
• Transmission used behind hemi: 833 4 Speed with 294 Rear Gear
• If manual, what clutch was used: Hydraulic McLeod Kit
• What transmission mount was used: Stock
• What adapters were needed to get the trans to mate/work: None
• What modifications were required to the car to make the hemi fit/work: None
• Biggest challenge/problem encountered and how it was resolved or overcome: Getting the Dominator tuned, but I studied and got it running well.
• What would you have done differently: Maybe going with Hotwire Harness
• How do you like it: Love it....driving it daily now and waiting on my AC kit to install

 

[70chall440]

• Car new hemi was put in (make, model, year): 1969 Charger
• New gen hemi size: 6.1
• New gen hemi year: 2008
• What did the new gen hemi come out of or was designed for (car/truck): Challenger
• Carb or EFI (type, brand, etc): EFI
• What intake was used: Stock
• What exhaust manifolds/headers were used: TTI
• Modifications made to the new gen hemi: None
• Type ignition used: Stock
• What PCM was used: Holley Dominator
• What harness was used: Holley
• What front serpentine system was used: Stock
• What alternator was used: Hemi 2005 unit with mopar adjustable voltage regulator
• What PS pump was used: Stock
• What motor mounts were used: Shumacher
• Transmission used behind hemi: 833 4 Speed with 294 Rear Gear
• If manual, what clutch was used: Hydraulic McLeod Kit
• What transmission mount was used: Stock
• What adapters were needed to get the trans to mate/work: None
• What modifications were required to the car to make the hemi fit/work: None
• Biggest challenge/problem encountered and how it was resolved or overcome: Getting the Dominator tuned, but I studied and got it running well.
• What would you have done differently: Maybe going with Hotwire Harness
• How do you like it: Love it....driving it daily now and waiting on my AC kit to install

I really appreciate you taking the time to fill this out, it is very helpful. Did the trans have to be modified at all to work? I am in the planning stages of putting a G3 into my 71 Charger I am building and will be using a A833.

 

[jgmccrac]

I really appreciate you taking the time to fill this out, it is very helpful. Did the trans have to be modified at all to work? I am in the planning stages of putting a G3 into my 71 Charger I am building and will be using a A833.

No. I didn't have to modify anything, but I will say that there are two things that I learned in the process....

#1. Be careful when bolting on the trans to the engine. If you don't do a runout to ensure the engine and tranny fit flush, you could have an alignment issue when trying to line up the drivetrain. I had to use alignment dowls to get the tranny to sit flush. The bellhousing, I guess, wasn't true causing the issue.

#2. If you use a hydraulic clutch setup, be sure and plan for your pedal ratio. Using stock pedals create some geometry issues. If I had it to do over, I would have gone with a Wilwood Brake/Clutch pedal setup. The clutch is stiff.

Jonas

 

[70chall440]

Jonas - thanks again, that is really interesting information. I did a hyd clutch in my 73 Cuda, however I didn't use a hyd TB, I used a slave cylinder set up and it is stiff as hell. I have been racking my brain trying to figure out why it is this way.

Good advice on the alignment, I will certainly pay attention to that.

 

[rolling_Thunder]

Jonas - thanks again, that is really interesting information. I did a hyd clutch in my 73 Cuda, however I didn't use a hyd TB, I used a slave cylinder set up and it is stiff as hell. I have been racking my brain trying to figure out why it is this way.

I would start by looking at the bore size on the slave cylinder as a starting point - just like a brake master cylinder the size effects pedal pressure.

 

[70chall440]

I need to find out what Mopar uses on the Challenger (as far as bore size)

 

[451Mopar]

Thanks for the thread. I must have missed it when first posted.

This should help motivate me to get back into that project.

 

[70chall440]

I hope more guys fill this out, I think it would be helpful

 

[Buckminster]

• Car new hemi was put in (make, model, year): '73 Challenger
• New gen hemi size: 5.7L
• New gen hemi year: 2006
• What did the new gen hemi come out of or was designed for (car/truck): 2006 Charger
• Carb or EFI (type, brand, etc): 2007 Factory ECM
• What intake was used: Factory
• What exhaust manifolds/headers were used: holley Blackheart cast manifolds
• Modifications made to the new gen hemi: None
• Type ignition used: Factory
• What PCM was used: 2007 Factory
• What harness was used: Planning to us Hotwire
• What front serpentine system was used: factory but using 2006 Commander Alternator for extra frame clearance
• What alternator was used: 2006 Jeep Commander
• What PS pump was used: factory with Sublime pressure regulator to reduce pressure
• What motor mounts were used: Holley
• Transmission used behind hemi: 2019 8HP70
• If manual, what clutch was used: NA
• What transmission mount was used: Holley
• What adapters were needed to get the trans to mate/work: NA
• What modifications were required to the car to make the hemi fit/work: cut hole in firewall for wires to ECU, mount ECU by heater box
• Biggest challenge/problem encountered and how it was resolved or overcome: So far, making the stock ECU fire up the engine. I'm trying to figure out the stock system to avoid paying the price of the hotwire system, but expect to have to go there. Will need the TCU portion of the system either way, since the 2007 ECU will not run the 8HP70
• What would you have done differently: Nothing at this time
• How do you like it: Car is in the body shop, so it is not in the car yet. Will know by summer 2025

 

[Sixpactogo]

• Car new hemi was put in (make, model, year): 68 Charger
• New gen hemi size: 6.1
• New gen hemi year: 2006
• What did the new gen hemi come out of or was designed for (car/truck): Charger SRT 8
• Carb or EFI (type, brand, etc): Factory EFI
• What intake was used: Stock 6.1
• What exhaust manifolds/headers were used: TTI Ceramic coated Headers
• Modifications made to the new gen hemi: None
• Type ignition used: stock
• What PCM was used: 2005 Hemi Truck
• What harness was used: Hotwire
• What front serpentine system was used: Stock 6.1
• What alternator was used: stock 6.1
• What PS pump was used: modified Jeep pump
• What motor mounts were used: TTI poly loc
• Transmission used behind hemi: 5R45RFE
• If manual, what clutch was used:
• What transmission mount was used: Modified cross member with GM insulator
• What adapters were needed to get the trans to mate/work: Hemi Truck flex plate and converter. RFE rear yoke adapted to drive shaft
• What modifications were required to the car to make the hemi fit/work: center sump oil pan, 45 degree oil filter adapter, modified dip stick and tube, radiator and electric fans, modified tunnel, New steel fuel tank with in tank fuel pump, fuel lines and regulator.
• Biggest challenge/problem encountered and how it was resolved or overcome: When I did my swap back in 2014, I bought a kit from Bouchillon Performance since they convinced me they knew what they were doing. While I had a few snags with their kit, most of it worked out. When I got it running, the computer was sending 15.1 volts to the system. I tried convincing Bouchillon the problem was in the computer but they blamed it on my wiring. After a few months of trial & error I finally got some readings of the codes that were set. One of them was showing that my battery ambient temperature was at -83 degrees F. It turns out Bouchillon's guru needed to disable that feature in the computer since I guess it was trying to warm up my battery. Once they got that feature disabled, everything works as it should.
• What would you have done differently: In 2014 the Nag 1 transmission was not a viable install but those issues have been since dealt with. If I had it to do now, I would use the Nag 1 because of it being a better transmission and it's smaller size and better gear ratio. Also, I would have swapped in a lumpier cam in place of the stock one. Not because of performance but because the stock 6.1 sounds a little too tame IMO.
• How do you like it: I love it. I like the performance, the fuel mileage, the grunt from the first two gears and the rpms at highway speeds. Also the fact that it can sit for months and start and idle with no hesitation. For me, it is the best of both worlds Old and New and looks stock until you open the hood. It ran a 12.88 at 103 mph on street tires in its only pass at Rock Falls raceway starting out in drive and shifting when it wanted with the AC on. Good enough for my old bones.
• Updates since the initial build: The Hemi didn't like the Corvette fuel regulator / filter provided by Bouchillon so I opted for an adjustable regulator with gauge for fine tuning. I also updated the Throttle body with an Arrington Performance 85mm unit. I didn't care for the electric fans running at full speed so I bought a H150 controller from Auto Cool Guy at Radio Research LTD. That enable me to ditch the two 30A relays for the fans since the controller doesn't need them and ramps up the speed slowly.

 

[PistolGrip6]

• Car new hemi was put in (make, model, year): 1969 Dodge Coronet
• New gen hemi size: 6.4L
• New gen hemi year: 2012
• What did the new gen hemi come out of or was designed for (car/truck): 2012 Dodge Challenger SRT
• Carb or EFI (type, brand, etc): EFI, Holley in tank pump and regulator.
• What intake was used: Stock SRV Intake
• What exhaust manifolds/headers were used: TTI Ceramic Coated
• Modifications made to the new gen hemi: Holley VVT Mid Mount Accessory Drive w/ATI Super Damper, Holley Mid Sump Oil Pan, 45 Deg Oil Filter Adapter, mini starter for header clearance.
• Type ignition used: Stock
• What PCM was used: Holley Terminator X Max
• What harness was used: Holley
• What front serpentine system was used: Holley
• What alternator was used: Holley
• What PS pump was used: Holley
• What motor mounts were used: QA1 on QA1 Coil Over K Frame
• Transmission used behind hemi: TR6060
• If manual, what clutch was used: Stock
• What transmission mount was used: USCT
• What adapters were needed to get the trans to mate/work: None
• What modifications were required to the car to make the hemi fit/work: USCT Transmission Tunnel Perimeter Frame, cut out for SRV module on wiper motor bulge
• Biggest challenge/problem encountered and how it was resolved or overcome: #1 To get the proper drive line angle measured at the transmission output shaft I had to make my own mounting tabs that attach to the transmission. The USCT mounting tabs would have made the spool mounts sit very low which would interfere with the exhaust and would have given very little surface contact to weld them to the perimeter tunnel. #2 SRV module interfered with firewall/wiper motor bulge. Fab’d up clearance.
• What would you have done differently: Swapped out the TR6060 to T56 Magnum for mounting options, drive shaft options, shifter mount base plate options.
• How do you like it: Not yet Complete
• Link to your build thread:

 

[PistolGrip6]

Some pics