Ballpark estimate for the cost to do a 5.7 Hemi swap in a '70 Charger

[furious70]

A turbocharged 383 is fun. It's not cheap or simple tho. But rewarding.
392 cam in a 5.7 changes it's attitude some

 

[Kern Dog]

I like the stock hood and have no interest in anything sticking out of it or a scoop on top of it.
I wouldn't mind a stroked 400 but I'm not aiming for the ultimate with this car, just a level of satisfaction that is probably just a few small moves from here. I built this 383 myself. The decks were squared and surfaced to have the pistons .005 below deck. The cam is the MP 280/474, not too wild. Yeah, it was just installed without being degreed. The heads are

The '346 heads were milled and cc'd to 84ccs so they had been milled a couple times before.
It isn't as if the car is a slug, it will peel out in a straight line and runs great, its just lacking the torque that the other cars have. The shorter stroke is probably at least partially responsible.

 

[furious70]

A modern cam and some TF or stealth heads would make you happy

 

[Kern Dog]

I was unaware of the costs to do a 3G Hemi swap until a few days ago. It was like the guy that looks outside, sees that it is sunny and steps out for a moment not knowing how damned hot it is.....then turns around and goes back inside.

 

[icetech]

stock converter?

 

[Kern Dog]

No, it is an 11” that was built by Lenny at UCC for approximately 2800 stall but that was behind the 440/493. I used the trans and converter from the red car when I swapped a 5 speed in it.

Maybe it does stall too low for a 383. Good point.

 

[Photon440]

Man, I've forgotten all the numbers......but a 400 block and 440 crank makes 451 iirc. That's also a good combo. Don't know about the 383 combos since the bore is smaller as I like big bore engines.

383 bore may be smaller, but 4.25" is still pretty good, it's the same as a Chev 427.

 

[icetech]

No, it is an 11” that was built by Lenny at UCC for approximately 2800 stall but that was behind the 440/493. I used the trans and converter from the red car when I swapped a 5 speed in it.

View attachment 1764643

Maybe it does stall too low for a 383. Good point.

yeah, if i understand properly lower torque will make the converter not flash as high? so that could be a lot lower than 2800... is it doggy all around or just from a stop?

 

[Kern Dog]

Once I'm up to speed, it picks up nicely. It was first put on the road with a 3.23 and ugh...it felt way too slow. I have a 3.91 in it now and while it is better, it still lacks the snap of the Dart or other Charger.
I have another factory "Hi-Stall" that I got some time ago. I had it gone through at a converter shop in town. I could swap it in in half a day and know if it helps.

 

[icetech]

Once I'm up to speed, it picks up nicely. It was first put on the road with a 3.23 and ugh...it felt way too slow. I have a 3.91 in it now and while it is better, it still lacks the snap of the Dart or other Charger.
I have another factory "Hi-Stall" that I got some time ago. I had it gone through at a converter shop in town. I could swap it in in half a day and know if it helps.

couldn't hurt... with 3.91s i would think that thing would be zippy.. i never used that cam though.. my 400 had a .484 in it and LOVED that cam

 

[Kern Dog]

I had this same spec cam in my first 440 in the red car. It would spin the peg leg single tire all the way to where I got tired of peeling out and just let off the gas and let the tire hook up. With a 3.91 SG in it, it ran a 14.01 at 101 with a crappy 2.40 60 ft time. Zero traction but once it hooked up, it ran strong.

 

[PA_65_Plymouth]

Do you want ac?
If not the eagle truck accessory drive is fine. Later one with electric ps if you don't have ps in that one.

The carb intakes are rare and kill tq from the dynos I've seen, race only IMO.

My 6.1 stroked to 426 with a Prefix carb intake and 1000cfm carb, small cam and 10.9 cp made 620/540 on the dyno

 

[furious70]

My 6.1 stroked to 426 with a Prefix carb intake and 1000cfm carb, small cam and 10.9 cp made 620/540 on the dyno

View attachment 1766038

426" vs 345" tho

 

[Kennith]

Not a price but a lot of information about everything used to put a 5.7 in a 1968 Dodge Charger.

 

[Buckminster]

I am doing a budget build 5.7L hemi with an 8 speed 8HP70 to take advantage of the 8HP's .66:1 OD ratio. I did the math on rebuilding the 340 that i have in it and adding a GV's OD. and the costs for a budget build are similar. I budgeted $9K and have been tracking the costs to date. The most expensive part is the Hotwire harness and ECU mods, since I've gone with a non-factory combination. the 8HP70 was never supplied with an early Gen III hemi. that was $2,650 for the wire harness, and trans controller. I bought a 2006 Dodge Charger that had just had a rebuilt engine installed, and then that owner subsequently wrecked, for $4K. I pulled the motor and sold most of what I could for a net investment of $1,500 bucks. Could have bought a motor for less than that, but this one had less than 1,000 miles on a rebuild. So far, using Holley tranny mount, hooker blackheart cast manifolds, holley cast oil pan and a lot of salvage yard scavenged parts (2006 commander alternator (smaller), angled oil filter adapter, etc.) and i'm under budget by about $1K so far. I budgeted for all new parts, but have been able to scrounge stuff. I am doing all the work myself, so that helps tremendously. If you want more details, happy to share what I know. This is still in work, so final tally is not done. This also included the cost of HP tuner to tune the ECU for future mods.

 

[Butch Harley]

I just bought another car.

 

[coloradodave]

I have hemi fever soooo bad.... funny thing is i don't need more than like 450hp.. and i can do that with a small block.. but... still want one.. I will polish it and stare at it and smile

Is this too much to ask...
View attachment 1764489

Would a 392 work? There's got to be thousands of those with superchargers sitting unused in ex drag racer's garages, minus the accessories. Try Racingjunk.com ...

 

[Dennis H]

You managed to drag both Durwood AND Colorado dave out of the woodwork with this thread. I second the 392, but they don’t like Blowers. That’s why the 6.2 went in the Hellcats.