Hemi engine swap..is it worth it

[71scamp78]

Well finally got good news on the 5.7 Hemi today. Block is good for a build woo hoo. Been thinking pretty hard on it and I think I'm going to build a stroker to a 392ish depending on final bore size. I'm looking at the Scat forged assembly it says 10 to 1 compression which should be good for my build. Going with a comp stage 2 cam and Hemi 6 with a carburetor obviously. I would think I should hit 500 crank HP easily. Has anyone here used Scats kit and also will the Hemi 6 work on a stroker. I tried calling Holleys tech line but was on hold for 20 minutes and got nowhere.

 

[408 swinger]

Well finally got good news on the 5.7 Hemi today. Block is good for a build woo hoo. Been thinking pretty hard on it and I think I'm going to build a stroker to a 392ish depending on final bore size. I'm looking at the Scat forged assembly it says 10 to 1 compression which should be good for my build. Going with a comp stage 2 cam and Hemi 6 with a carburetor obviously. I would think I should hit 500 crank HP easily. Has anyone here used Scats kit and also will the Hemi 6 work on a stroker. I tried calling Holleys tech line but was on hold for 20 minutes and got nowhere.

I run the Hemi 6 on my 426 stroker. All good. I'd have to look up that cam, but, you should very easily clear 500. I've used the SCAT stuff in LA small block stuff with success. It's good stuff.

 

[loganscuda]

Here’s what I did with my column. I went Alterkation rack and pinion and I got a good deal on a flaming river tilt column. I used the original housing, column drop and floor plate and slid the flaming river column right inside the housing. Just FIY. In the pic you can see how close the original would sit to the valve cover.

 

[71scamp78]

I run the Hemi 6 on my 426 stroker. All good. I'd have to look up that cam, but, you should very easily clear 500. I've used the SCAT stuff in LA small block stuff with success. It's good stuff.

Yes I used scat on a LA and rb build no issues. Was just curious on the new hemis so good to hear. So the Hemi 6 will work fine on my stroker just need the 32 tooth wheel .

 

[408 swinger]

Yes I used scat on a LA and rb build no issues. Was just curious on the new hemis so good to hear. So the Hemi 6 will work fine on my stroker just need the 32 tooth wheel .

10-4!

 

[Kiddart1]

71scamp 78,

when you order you stroker kit you might be able to get the crank with a 32 tooth wheel

 

[392heminut]

Any of you guys that have commented on my post running a msd hemi 6 control box . If so what cam, intake and carb and you using. Are you happy with results and has tuning been hard or easy. Thanks

I'm running a Hemi6 controller on a 2005 5.7 Hemi out of a Ram truck. I have a Mopar Performance crate motor intake with an Edelbrock 750 carb, and I swapped in a 6.1 cam before I put the engine in my 70 Cuda. I'm very happy with the setup, it runs great and is trouble free. I haven't done any tuning on the timing curve, I'm running what was programmed in the Hemi6 from the factory.

 

[71scamp78]

I'm running a Hemi6 controller on a 2005 5.7 Hemi out of a Ram truck. I have a Mopar Performance crate motor intake with an Edelbrock 750 carb, and I swapped in a 6.1 cam before I put the engine in my 70 Cuda. I'm very happy with the setup, it runs great and is trouble free. I haven't done any tuning on the timing curve, I'm running what was programmed in the Hemi6 from the factory.

Awesome that's what I like to hear. The 5.7 stroker with eagle heads and a comp stage 3 cam along with a prefix intake should scoot in the dart

 

[71scamp78]

392heminut you got any pics of it in engine bay

 

[392heminut]

392heminut you got any pics of it in engine bay

I can't tell for sure, but I think this pic was when I still had the Holley 750 Vac. Sec. carb on it. I got tired of the leaks on the Holley and switched over to the Edelbrock.

 

[71scamp78]

Looks good. Nice

 

[Furious65]

View attachment 1715783183

I can't tell for sure, but I think this pic was when I still had the Holley 750 Vac. Sec. carb on it. I got tired of the leaks on the Holley and switched over to the Edelbrock.

Man, that looks like a really clean install and that it belongs there.

 

[74 DART']

Correct. Bone stock Eagle except for the 6.4 cam. No porting to intake, out of the box, on to the engine. It'll turn the tires when commanded.

On your Eagle with the 6.4 cam what did you do about the VVT ? Did you have to lock out the phaser or just leave solenoid unplugged ?

 

[408 swinger]

On your Eagle with the 6.4 cam what did you do about the VVT ? Did you have to lock out the phaser or just leave solenoid unplugged ?

Just left it unplugged. That combo is long gone. Ran okay, but, that cam really needed the vvt function to work well. When staying fuel injection, that 6.4 cam works very well.

 

[92b]

Awesome that's what I like to hear. The 5.7 stroker with eagle heads and a comp stage 3 cam along with a prefix intake should scoot in the dart

What is a prefix intake? Also you may have already seen this. If not it's worth a look.

 

[abodyjoe]

What is a prefix intake? Also you may have already seen this. If not it's worth a look.

watched that a while back. basically build an eagle headed EFI hemi. anything else is wasting time and money.

 

[HPP]

I'd say it depends on what you are starting with and where you want to be. If you have a stock 318 or 360 needing rebuilt, is spending $3500 on them 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 there 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.

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

 

[71scamp78]

Old thread i posted. Ive done 5 Hemi swaps since then lol. I highly recommend it

 

[Ceedawg]

I'd say it depends on what you are starting with and where you want to be. If you have a stock 318 or 360 needing rebuilt, is spending $3500 on them 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 there 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.

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

If one can’t get more than 400 hp with $3500 go play pickle ball.

 

[74 DART']

Just left it unplugged. That combo is long gone. Ran okay, but, that cam really needed the vvt function to work well. When staying fuel injection, that 6.4 cam works very well.

Thanks. Any advice for the charging system ? I have a 2014 alternator so PWM. Not crazy about using the original wiring from 1974.

 

[74 DART']

Old thread i posted. Ive done 5 Hemi swaps since then lol. I highly recommend it

Did you wind up running a carb on any of them ? Any advice from your experience ? Thanks

 

[408 swinger]

Thanks. Any advice for the charging system ? I have a 2014 alternator so PWM. Not crazy about using the original wiring from 1974.

Although, the 03-08 systems are regulated via the computer, the two wire plug can be retroed to the old voltage regulator. The Eagle stuff is another animal entirely. I forget how it exactly it works, like a pulse wave or some **** like that. I spent a **** ton of money on a Powermaster alternator for the Eagle setup. Not sure if this applies to the Eagle stuff, @racerjoe did a write up for his own one wire conversion.

 

[92b]

watched that a while back. basically build an eagle headed EFI hemi. anything else is wasting time and money.

It's nice to be able to learn things on other people's money.

 

[Dartswinger70]

Any suspension mods to handle all that powah? wouldn't all that Tork pop the windows out etc?

 

[racerjoe]

Although, the 03-08 systems are regulated via the computer, the two wire plug can be retroed to the old voltage regulator. The Eagle stuff is another animal entirely. I forget how it exactly it works, like a pulse wave or some **** like that. I spent a **** ton of money on a Powermaster alternator for the Eagle setup. Not sure if this applies to the Eagle stuff, @racerjoe did a write up for his own one wire conversion.

Judging by appearance, the alternators look the same, which means the modification I came up with may work. I would need to see the back side of the alternator with the cover removed to determine that. I also heard maybe you can use the pulley from and eagle on an early motor to make the pulley alignment work. I'm not 100% on that.