The World of CARB Legal Conversions with Hemi Engines

 “My dad had a candy-apple red sparkle drag boat with a giant hemi engine in it that he raced professionally. The sound of that engine was the most incredible sound ever.” — Brian Reitzell

Doesn’t this quote put you right in a seat in that drag boat? That drag boat’s engine racing and ready to take off with power, speed and excitement. Oh, you bet big time buddy! That sound is so enveloping and exciting and to us, unlike anything else. If you are feeling that vibe, like we are, and want to get a little taste of what that could mean for you and your Jeep. Then let us tell you, Jeep Speed Shop specializes in custom CARB Legal Conversions with Hemi Engines. In fact, Jeep Speed Shop is the only shop in the country that has a CARB Legal solution. What does this mean? Keep reading to find out…

First things First…What is a Hemi Engine?

Young female standing infront white JeepBefore we get into CARB legal Conversions with Hemi Engines, we’d like to tell you about the beautiful Hemi engine itself. “A Hemi is an engine with a hemispherical combustion chamber, consisting of dome-shaped cylinders and piston tops. Hemispherical refers to a half-sphere, so the piston tops have to be rounded in order to fit properly within the cylinders. With a smaller surface area than a typical flat-head engine design, less heat is able to escape. Because there is less heat loss, peak pressure is higher in a Hemi engine. Higher pressure means more energy, which in return will give you more power. Valves are also less restricted in a Hemi engine design, so they can be larger in order to allow for more airflow, whether that’s bringing cool air in or sending exhaust gases out. The spark plugs also provide better ignition combustion due to their position within the chamber. All of these things help differentiate the Hemi from flat-top engines and contribute to the Hemi’s power.”

What is CARB?

CARB is an acronym for California Air Resource Board. The California Air Resource Board is the “clean air agency” which is responsible for managing air sanitation and motor vehicle pollution. California is currently the only state that can have such a regulatory agency, but other states can still follow the CARB standards. The stated goals of CARB compliant include:

  • attaining and maintaining healthy air quality
  • protecting the public from exposure to toxic air contaminants
  • providing innovative approaches for complying with air pollution rules and regulations

CARB prohibits conversion of any emission-controlled vehicle with a retrofit system unless they have already evaluated and certified the retrofit systems. Jeep Speed Shop has gone to great lengths to obtain the certification for our retrofit system. CARB issued certification to us after we demonstrated compliance with warranty, emission, and the durability requirements.


According to CARB, a manufacturer is any individual who assembles or manufactures alternative fuel retrofit systems for sale within California. SO… that’s us!

CARB Legal Conversions with Hemi Engines

We at Jeep Speed Shop located in Cotati, California worked hard to become the first Wrangler specialists who engineered the industry’s first 50-state legal JK HEMI conversion. The Wrangler JK V8 conversion from Jeep Speed Shop is the complete CARB legal Jeep Hemi engine conversion kit. 

We are so happy to have our CARB-certified Jeep JK Hemi Engine Kit approved from the hard to please California Air Resource Board. There’s no need for a middle-man any longer. We’ve done all the work for you. 

Jeep Speed Shop is ready to go!

I think it’s safe to assume, if you’ve made it to the end of this post, then you are intrigued and want to learn more about CARB Legal Conversions with Hemi Engines. Let’s set up a consultation so we can discuss all the possibilities for your jeep engine conversion. Please click the following link to reach out to us. You can also call us at 707-338-3154. We are ready to go and look forward to the possibility of working with you.