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Discussion Starter #1
Eventually I would like to do an engine swap to the 426 alluminum. I have a 5.7 M6-STP and part # P5155459 appears to be the engine it uses yet it shows to be for off road use only. Not sure how old this catalog is but it would seem likely that if the 5.7 and the 6.1 made it to be CARB friendly then the 426 has a chance. Maybe a couple of years of the HellCat before the glory of the 426.

Anyone care to comment?

http://www.mopar.com/assets/pdf/performance/catalog/Hemi_Gen_III.pdf

Mechanical and/or electronic performance parts listed
in this catalog with a “1” cannot be used on vehicles used on public streets or highways.

426 Hemi Crate Engine, 540 Horsepower – “1” P5155513
6.1L Hemi Crate Engine - 425 Horsepower – “1” P5155067
5.7L Eagle Crate Engine, 372 Horsepower – “1” P5155459
 

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Eventually I would like to do an engine swap to the 426 alluminum. I have a 5.7 M6-STP and part # P5155459 appears to be the engine it uses yet it shows to be for off road use only. Not sure how old this catalog is but it would seem likely that if the 5.7 and the 6.1 made it to be CARB friendly then the 426 has a chance. Maybe a couple of years of the HellCat before the glory of the 426.

Anyone care to comment?

http://www.mopar.com/assets/pdf/performance/catalog/Hemi_Gen_III.pdf

Mechanical and/or electronic performance parts listed
in this catalog with a “1” cannot be used on vehicles used on public streets or highways.

426 Hemi Crate Engine, 540 Horsepower – “1” P5155513
6.1L Hemi Crate Engine - 425 Horsepower – “1” P5155067
5.7L Eagle Crate Engine, 372 Horsepower – “1” P5155459
The off road only means it is not street legal because it dose not meet emission standards and can only be used for racing applications.
 

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If your vehicle is registered and licensed for use on public roads, or if your vehicle is EVER operated on a public road, it is not wise to install parts that are illegal for use on a vehicle that is operated on public roads.

In other words, what part of "Off road use only" do you not understand?

If you are planning on operating your vehicle exclusively on race tracks, and have a trailer to bring it to every race, then go ahead and build yourself a race car.
 

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I'm sure that engine is run on-road in plenty of vehicles where there are no state emissions checks. It's also against federal law to do so, but how would anyone ever find out? Plenty of people on this site have removed their cats and that is illegal as well. You are taking a risk by doing anything that violates any state and/or federal emissions laws.
 
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These motors are for Drag packs and Resto-Mods, They dont even come with a Drive by Wire TB or work in a 09+ without some serious modification The reason for the Off road use is because it is a Mopar part and there is no Warranty and it will not comply with EPA. Much cheaper and easier to go with an aftermarket 426.
 

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Discussion Starter #10 (Edited)
If your vehicle is registered and licensed for use on public roads, or if your vehicle is EVER operated on a public road, it is not wise to install parts that are illegal for use on a vehicle that is operated on public roads.

In other words, what part of "Off road use only" do you not understand?

If you are planning on operating your vehicle exclusively on race tracks, and have a trailer to bring it to every race, then go ahead and build yourself a race car.
Thanks Dad, just wanted to know if there was a difference between the two engines. Thank you for an excellent well written reply.
 

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Discussion Starter #11
These motors are for Drag packs and Resto-Mods, They dont even come with a Drive by Wire TB or work in a 09+ without some serious modification The reason for the Off road use is because it is a Mopar part and there is no Warranty and it will not comply with EPA. Much cheaper and easier to go with an aftermarket 426.

Will the aftermarket 426's comply with EPA?
 

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Why not stroke

to 426?
 

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What's the big deal about 426 cubes anyway?
It's just an "iconic number" for the Chrysler Hemi of old.

A lot of folks like the idea of the GenIII Hemi being that displacement "for old times sake"

Several of our vendors on this site have stroker packages or complete motors with this displacement, or displacements very close.

They can explain it better, but there's advantages to certain bore/stroke ratios over others on the GenIII engines, depending on what block is used.
 
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