What do you guys think about this engine build?

[kg93]

So I'm setting out to have my engine done by the end of this year. I kept asking myself, what direction should I go?

I wanted to keep offroad reliability with heavy 37s and mud tires but make some good power.
I was on the edge about a supercharger(roots style)

But I think today i finally figured it out, I spoke with the guys at Extreme Mopar Performance in NY, they have some sweet builds making some good power. Gen 3 specialists, mostly chargers/jeeps/challengers..but they've done a few trucks.

anyway the one guy has a 405 stroker with heads/6.1 intake.

He recommended the 405 build, he said i would get about 500 torque around 2500-3000 rpm. Exactly what I'm looking for some nice down low torque.

I don't have a full list of the parts that it would include but he said the block and cam would run $5500 total "built with top of the line 1000hp forged components"

He also stated that he made 100+ passes at the track this past year and didn't have any issues, so that solves the reliability thing in my eyes.




What do you guys think of that bang for the buck?
Im thinking the trans would need to be built also at that point, thoughts?

 

[Hemipower392]

I've never been into performance upgrades because of $$ so Idk if its a good deal or not. But 500 lbs of torque, dang that'd be sweet.

 

[charonblk07]

A 405 stroker is great if you're staying N/A, it will have lots of torque which is what you want for the 37s. Since yours is a 4th gen it's a little more difficult but it can still be done and you'll have lots of fun with the stroker. There's always the option of starting with a 6.4L block and stroking it up to a 426 for some more fun. Yes, your trans would need to be beefed up to handle the power if it's a 5/6 speed.

 

[avantiguy]

Stroker Hemi engines of lower torque from decent manufactures go in that range. One built by someone that knows what they are doing with high quality parts and will stand behind it is good value IMO. These aren't SBC's but high torque engines that will put a lot of stress on the internals. If there reputations supports their claims, I'd work with them.

As said above, match your other components to the engine output.

Increasing HP/Torque ain't cheap.

 

[catch 22]

Check these guys out also, can't beat 3 year/36,000 mile warranty on some serious HP.

Mopar Pro Shop - Mopar Performance Parts (MoPowered) - PERFORMANCE ENGINES

 

[kg93]

A 405 stroker is great if you're staying N/A, it will have lots of torque which is what you want for the 37s. Since yours is a 4th gen it's a little more difficult but it can still be done and you'll have lots of fun with the stroker. There's always the option of starting with a 6.4L block and stroking it up to a 426 for some more fun. Yes, your trans would need to be beefed up to handle the power if it's a 5/6 speed.

lol i wish but that 6.4 would probably be twice as much overall.

Lol 6 speed, when i get it done itll probably only last the trip down to Delaware to get it built. Wish i could just get a nag1 or something fabbed up to fit.

Check these guys out also, can't beat 3 year/36,000 mile warranty on some serious HP.

Mopar Pro Shop - Mopar Performance Parts (MoPowered) - PERFORMANCE ENGINES

those are some expensive engines though!

 

[charonblk07]

lol i wish but that 6.4 would probably be twice as much overall.

Lol 6 speed, when i get it done itll probably only last the trip down to Delaware to get it built. Wish i could just get a nag1 or something fabbed up to fit.



those are some expensive engines though!

Talking with Dave at Modern Muscle they've done a few NAG1 swaps into the trucks and I know Mike at L&M has done a complete GCSRT drivetrain swap into a truck for some nice AWD power.

 

[kg93]

Talking with Dave at Modern Muscle they've done a few NAG1 swaps into the trucks and I know Mike at L&M has done a complete GCSRT drivetrain swap into a truck for some nice AWD power.

do the swaps that dave has done retain the 4wd? I wouldn't want to go to awd.
If i could retain 4wd have a 405 stroker...and a nag1 and not worry about tranny issues that would be wonderful

 

[charonblk07]

do the swaps that dave has done retain the 4wd? I wouldn't want to go to awd.
If i could retain 4wd have a 405 stroker...and a nag1 and not worry about tranny issues that would be wonderful

As far as I know you either get 2wd or AWD since the transfercase is only an AWD cast in the CGSRT8 and no, you can't adapt the stock transfercase to the Nag1.

 

[kg93]

As far as I know you either get 2wd or AWD since the transfercase is only an AWD cast in the CGSRT8 and no, you can't adapt the stock transfercase to the Nag1.

ahh yeah that's what sucks. Until someone figures out how to get a 4wd transfer case to work i guess ill be sticking to building the current tranny

Mikes only 2 hours away from me so as long as i could make it down there. Ill just try to save up enough to do both at the same time

 

[MANual_puller]

With 1000 hp internals you could always swap cam and boost later if you want more

 

[brusk]

Sorry I'm not understanding how the 500 ft lb or torque is coming into here. a SRT 6.4 is 470, a truck 6.4 is 429. Even if you stroked a SRT 6.4 to 6.6 I don't see 500 happening.

 

[kg93]

Sorry I'm not understanding how the 500 ft lb or torque is coming into here. a SRT 6.4 is 470, a truck 6.4 is 429. Even if you stroked a SRT 6.4 to 6.6 I don't see 500 happening.

headers,intake,tune,cam. The tune would be much more aggressive than a stock engine tune also i would think

 

[brusk]

headers,intake,tune,cam. The tune would be much more aggressive than a stock engine tune also i would think

Guess that's my point the SRT 6.4 already outflows ported 5.7 setup I see it being difficult for an SRT setup to push that kind of torque let alone a truck setup. Race fuel maybe but see that being a little much for pump. I'm game to see the dyno when it's done though.

 

[kg93]

Guess that's my point the SRT 6.4 already outflows ported 5.7 setup I see it being difficult for an SRT setup to push that kind of torque let alone a truck setup. Race fuel maybe but see that being a little much for pump. I'm game to see the dyno when it's done though.

Well the one guy has the 405 build with built 6.1 heads and intake manifold and ran a 11.38 @119 NA in his charger so I guess he's making a good amount of torque

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[charonblk07]

Guess that's my point the SRT 6.4 already outflows ported 5.7 setup I see it being difficult for an SRT setup to push that kind of torque let alone a truck setup. Race fuel maybe but see that being a little much for pump. I'm game to see the dyno when it's done though.

High rpm and short stroke makes bigger hp numbers but a longer stroke will make more torque because it creates a lot more vacuum in the cylinder so the air flows in faster which is required for more torque at lower rpm. I've seen plenty of 5.7L based 392cuin strokers make 450ft-lb and most 400+ easily make in the high 400s depending on how much compression they are running.


The 6.4L based 426 is making 500+ft-lb on many builds and has the added benefit of still having lots of sidewall so there's no issues with cylinder deformation. Race fuel is not needed to get these numbers, neither is e85, but these are numbers from other N/A builds who are running performance oriented engines which includes the above mentioned cam, heads, headers, etc. all of which are required to get to those numbers. A short block by itself makes 0hp/0ft-lb.

 

[RLJ10X]

If you don't have 4.10 or 4.52s, you're wasting your time and money.

 

[kg93]

If you don't have 4.10 or 4.52s, you're wasting your time and money.

4.56 but yeah i have everything just didn't do it yet

 

[Hemipower392]

I wouldn't say he's wasting money haha

 

[xrsman]

Sounds like a pretty cool engine build!

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