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Due to the global COVID-19 supply chain issues please expect longer than normal lead times and increased shipping costs, thank you.

Reviews and Testimonials

John Clifford was outstanding to work with. He answered phone calls and e-mails in a timely manner and provided all the information he promised. I’m very grateful to John for all the patience he showed in our communication. You will definitely appreciate dealing with Big Bear Engine Company. They are in short, a “class act.”

Rod Dickson, Roseburg, OR

We are doing a 4BT sway in Jeep TJ wrangler and wouldn't go anywhere else to source our 4BT! We have always been treated great and John is very knowledgeable and professional. The customer service and products are top of the line. We will be sending everyone there that is looking for a diesel engine!

Paul Andersen: Golden Spike Off-Road, Garland, UT

I am very very very pleased with the service I received from John Clifford. He helped me from day 1 of me looking into buying a 4bt. He answered all my questions and replied to all of my emails (which were a lot of emails) and got back to me extremely fast every single time also kept me updated on my motor every time the status changed and let me know all about the process very thoroughly. I am very happy with big bear engines and will most definitely use them again! Thank you so much John! 🙂

Seth Prett, Reno, NV

Great local business! John was very helpful when it came to me purchasing a 3.9L 4BT Cummins for a build. I would definitely go back to these guys if I needed to source another motor.

Andrew Willard, North Andover, MA


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