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6.4 Ram Hemi

Started by Cudajason, August 12, 2025, 05:36:26 PM

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Cudajason

Quote from: ec_co on August 18, 2025, 05:40:34 AMFWIW the 5.7 Hemi can take the 392 cam for a nice little bump. In my 2010 Challenger I put in a 392 cam, HP springs and non MDS lifters, tuned out the MDS function as well. After a full Dyno tune it was putting out about 460 crank horsepower compared to 375 factory.

interesting!!! 

1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.


ec_co

Quote from: Cudajason on August 18, 2025, 06:33:49 AM
Quote from: ec_co on August 18, 2025, 05:40:34 AMFWIW the 5.7 Hemi can take the 392 cam for a nice little bump. In my 2010 Challenger I put in a 392 cam, HP springs and non MDS lifters, tuned out the MDS function as well. After a full Dyno tune it was putting out about 460 crank horsepower compared to 375 factory.

interesting!!! 



Here is the build thread with part numbers and the dyno

https://www.challengertalk.com/threads/10-rt-upgraded-to-392-cam-6-1-headers-3-dynomax-cat-back-dyno-results.694844/#post-8777832


The only thing flat earthers fear, is sphere itself.

'70 Barracuda B5/B5 225 /6 3spd ... about as bare bones as they came .... now in 4spd flavor

www.eyecandi3d.com for Reproduction Fender Tags

Cudajason

I have been crunching some numbers...and yeah this can get expensive.

I think the costs to just install a create engine, oil pan wiring etc. come in around $6,200 and change. plus, the engine.
If you can find a good used car engine, all the same stuff is needed, and you can drop the FED accessories assuming the all come on the car engine, and you are around $5,500.

A good used truck engine and you have to add in a different front cover, intake and throttle body, at $7,000. 
That is an after market intake and TB, so you could likely do it cheaper.  you can also step up to the holey midmount system for $3,000 more.

I see both 5.7 and 392 truck engine listed online for $1,000 that say tested and ready to run. 
Either way, find a low milage used engine, for even 3K and you are well below the cost of a Crate hemi and still have room to play.
All in, it looks like I could pick up one I could have it in and running for about $8,000 – 10,000 USD $11,500 – 13,000 CAD.
That is all with no price matching or shopping around, using a Mopar harness, so you might be able to bring that down some.
I have to admit, I am really thinking about this one.  I will run out the summer with my 360, I am still not 100% sure I did not hurt it and start saving some coin.

I am going back and forth in my head, on Gen 3 vs stroke my 360, because there is something cool about an old school carbed engine, but the more I drive it, the more I think the FI and a little, ok maybe a lot more power would be cooler.  Stroking the 360 would likely require new heads to get to the power level of the Gen 3, and that and all the machine costs etc, its likely more expensive!!! And then you have all the same challenges of running a carb.  So...

1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.



HP2

Yea, G3 swaps can get expensive in a hurry. If you stay carbureted, that would help some as it minimizes the wiring and control systems you would need over efi. Yes, you need a carb specific manifold, but you may realistically already have a capable carb. Ignition control could be a Blackbird system for $750.  https://blackbirdperformanceproducts.com/collections/all-parts-accessories/products/blackbird-performance-afterburner-ignition-system  Not sure how that compares to a full blown control system but I'd have to guess it's about half.

One advantage I see about G3 parts and systems is that if you decide to go a different direction after starting out, there is a market to sell these parts pretty easily.

Brads70

Maybe take the winter to look around and see what pops up? Maybe Alan will have a customer pulling a good engine for a high dollar build....?

Cudajason

Quote from: Brads70 on August 24, 2025, 02:36:34 PMMaybe take the winter to look around and see what pops up? Maybe Alan will have a customer pulling a good engine for a high dollar build....?

I am not going to jump into anything right now. I am tempted though.  I am driving my car more then I usually do this year and enjoying it, so I want to make it better.

not a bad idea checking in with Alan.

1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.


HP2

Some comparative info for you to kick off the research.

https://youtu.be/U0w9Y21r8nc

My quick summation - If you have a stockish 360 needing rebuilt, is spending $3500 on it to get to 400hp worth it compared to spending the same amount on an early style 5.7 with a carb? They did admit they may have spent more on that engine than necessary, but they also didn't include any transmission adapters that will be needed for a usable street car, so its probably a wash.

By comparison, the Eagle engine at 500 hp is a much nicer deal for the same dollars spent. Getting an LA to that 500 hp level for $3500 ain't going to be possible for most people.

How accurate is their pricing since this is a 3 years old video? I'd say somewhat optimistic depending on where you live and your access to yards. I'm not finding any $500 early G3 Hemis in salvage yards where I live.


Cudajason

Quote from: HP2 on August 26, 2025, 12:17:32 PMSome comparative info for you to kick off the research.

https://youtu.be/U0w9Y21r8nc

My quick summation - If you have a stockish 360 needing rebuilt, is spending $3500 on it to get to 400hp worth it compared to spending the same amount on an early style 5.7 with a carb? They did admit they may have spent more on that engine than necessary, but they also didn't include any transmission adapters that will be needed for a usable street car, so its probably a wash.

By comparison, the Eagle engine at 500 hp is a much nicer deal for the same dollars spent. Getting an LA to that 500 hp level for $3500 ain't going to be possible for most people.

How accurate is their pricing since this is a 3 years old video? I'd say somewhat optimistic depending on where you live and your access to yards. I'm not finding any $500 early G3 Hemis in salvage yards where I live.

Come on H @HP2 you are killing me man.

I could walk out today and grab a 2015 5.7 for $999 CAD with 80K on it.

Cam from Summit in the range of the video is about 600 USD.

lifters if needed, another 500 USD, and what maybe a few hundred for gaskets and you have a streetable 500 HP engine.

The truck intake will not fit in cuda, or at least with the TB pointing straight up is a challenge, so another 500 for a blueprint engines intake, or souce a factory car intake.

You still have to put all the other parts together for the swap, but you have to do that anyway.

holy crap 500 HP i a cuda would rip! not to mention that TQ number!!!

Explain to me again why I need a crate engine.

Look I am not crazy about pulling the heads off to swap the cam, but that is pretty basic engine work...and you are still way ahead of a crate engine.  $16,980.00 CAD for a 392 crate at 485 HP.  $4K all in for the truck engine with more HP sounds like a win.  The only extra costs for the crate is really the  front drive accessories.

no way you are building a streetable 500 HP 360 for that kind of money.

Crap I think I talked myself into this with one video!

1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.


ec_co

I don't know if they have a similar search engine up in Canada, this one is an aggregation of salvage yards across the US sorted by distance, it can be a great tool to find either a full engine or an intake or other miscellaneous parts.

www.car-part.com
The only thing flat earthers fear, is sphere itself.

'70 Barracuda B5/B5 225 /6 3spd ... about as bare bones as they came .... now in 4spd flavor

www.eyecandi3d.com for Reproduction Fender Tags

Katfish

Curious how you normally drive the car?
How many miles per year?
Take it to the track?

Cudajason

Quote from: ec_co on August 27, 2025, 04:09:27 PMI don't know if they have a similar search engine up in Canada, this one is an aggregation of salvage yards across the US sorted by distance, it can be a great tool to find either a full engine or an intake or other miscellaneous parts.

www.car-part.com

Car part works in Canada too!!!

Quote from: Katfish on August 27, 2025, 04:54:12 PMCurious how you normally drive the car?
How many miles per year?
Take it to the track?

Great question.  I do not drive it enough, less then 1000 a year at this point.  With the a hemi I could see that going up.

Mostly street driving, no track time. 

I do see where yo are going, do I need 500HP...no, so i could save the cost there. do I want 500 HP...hell yeah, it sounds so cool to say you have a 500 hp cuda!!!!

Honestly, it is likely I will do the swap, but just put the stock 5.7 in the car for now. Upgrading the cam etc. afterwards is probably not too difficult.   I have done one in the car already!



1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.



Katfish

#26
If you're only driving 1000 miles, get the 500hp.
Once I decided to get a crate motor, my decision came down to:
400hp - $6k
500hp - $9k
700hp - $15k

I went with the 5.7 and it's perfect, breaks the tires loose at anything under 20mph.
I couldn't image having a Hellcat motor.
I wanted something I could jump in and drive everyday.

If we're honest with ourselves, I believe the amount of time the car gets driven is inversely proportional to the HP.
After driving the car for 2yrs, it's plenty and I love getting 20mpg.




Cudajason

Quote from: Katfish on August 28, 2025, 10:38:22 AMIf you're only driving 1000 miles, get the 500hp.
Once I decided to get a crate motor, my decision came down to:
400hp - $6k
500hp - $9k
700hp - $15k

I went with the 5.7 and it's perfect, breaks the tires loose at anything under 20mph.
I couldn't image having a Hellcat motor.
I wanted something I could jump in and drive everyday.

If we're honest with ourselves, I believe the amount of time the car gets driven is inversely proportional to the HP.
After driving the car for 2yrs, it's plenty and I love getting 20mpg.





Great comment, I agree.  Everyone that puts a Gen 3 in their car seems to say they drive it more.  That is what I want to do.

no way I go more then 500.  I may not even go that high, nit really sure.  a 392 Ram engine is 485...just saying.

Anyway, its days like today I am not even sure I want to convert it.

I just rolled 500 Miles for the summer, that is a lot for me, and the car is working good.  Its got its squeaks and rattles, and its a bit stinky at time, but runs ok, not amazing, but ok.

I wonder if I spend a little less money on new rear end gears, maybe a fuel injection system and chasing down a few of the squeaks etc. if that makes it more drivable.   :dunno:



1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.


JH27N0B

A little correction here, the Ram truck 6.4 has 405 HP not 485.  And has 429 ft lbs of torque.
The Scat Pack Challenger and Charger 6.4 "392" is the one that has 485 Hp, and it has 475 ft lbs of torque.

Cudajason

Quote from: JH27N0B on September 03, 2025, 11:34:33 AMA little correction here, the Ram truck 6.4 has 405 HP not 485.  And has 429 ft lbs of torque.
The Scat Pack Challenger and Charger 6.4 "392" is the one that has 485 Hp, and it has 475 ft lbs of torque.

lol damn google...should have looked at my first post!
1974 Cuda. 360 / A500 OD.  Yes its pink, no its not my wife's car!  Yes I drive it.



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