Big Bear Engine Company

Big Bear Engine Company Specialists in remanufactured, surplus and used Cummins 4BT, 6BT & Caterpillar 3306 Diesel Engines. All machine work is done in house in Denver, CO.

We specialize in new surplus Cummins 4BT, 6BT and Caterpillar 3306 diesel engines. In addition to surplus engines we are also a full service machine shop and engine remanufacturing facility. We also are a dealer for aftermarket parts with over 100,000+ parts available for all of the biggest diesel engine brands including Caterpillar, Cummins, Detroit, International, John Deere and Mack.

"The staff are very helpful and took great care of me. Aaron was great to work with and very knowledgeable! I will defin...
09/03/2026

"The staff are very helpful and took great care of me. Aaron was great to work with and very knowledgeable! I will definitely be using you guys in the future!" says Tony on Google

★★★★★ The staff are very helpful and took great care of me. Aaron was great to work with and very knowledgeable! I will definitely be using you guys in the future!

"Good people to work with and very helpful. Thanks for Big Bear team package!! Highly recommend!!!" says Timmy on Google
08/30/2026

"Good people to work with and very helpful. Thanks for Big Bear team package!! Highly recommend!!!" says Timmy on Google

★★★★★ Good people to work with and very helpful. Thanks for Big Bear team package!! Highly recommend!!!

Just a  photo dump.. To be continued! Call us if you have a project that you want to make cooler than the "LS" crowd... ...
08/27/2026

Just a photo dump.. To be continued!

Call us if you have a project that you want to make cooler than the "LS" crowd... projects are cooler if they aren't just like everyone else's!

"I Puchased a Cummins 8.9L nature gas engine from Big Bear. They are excellent operators.  Thanks to the team!!" says Br...
08/17/2026

"I Puchased a Cummins 8.9L nature gas engine from Big Bear. They are excellent operators. Thanks to the team!!" says Brendan on Google

★★★★★ I Puchased a Cummins 8.9L nature gas engine from Big Bear. They are excellent operators. Thanks to the team!!

"These guys are on it. Responded quick to any questions. They are on it when it comes to filling that order and getting ...
08/17/2026

"These guys are on it. Responded quick to any questions. They are on it when it comes to filling that order and getting it shipped. Motor came in a very well packaged crate. No hiccups, 5 stars all day." says Nason on Google

★★★★★ These guys are on it. Responded quick to any questions. They are on it when it comes to filling that order and getting it shipped. Motor came in a very well packaged crate. No hiccups, 5 stars all day.

Oh Boy..,, This one has been brewing for a bit! Getting so close we can smell it, Literally, when he spools up those com...
08/14/2026

Oh Boy..,, This one has been brewing for a bit! Getting so close we can smell it, Literally, when he spools up those compound turbo's you literally can smell nothing but fuel and then tires just a burnin'! Starting with a 6BTAA210HP Extended Long Block, Justin at Herring Automotive twisted this one up a little bit.. or maybe a lot o bit.. What it is: 1977 k-20 Boxed frame, Off-road designs 4 link with King 3.0 18-inch coils/bypass front and rear. Dana 60 upfront with upgraded shafts and a 14 bolt with a Artec truss kit out back. 12 valve Dps stage 3 compound turbos, Misimoto intercooler/rad packages, Psc hydraulic steering going to the Reid knuckles. A Square body syndicate gauge setup with Vintage air for comfort. Derale trans cooler keeping the Allison 1000 chilled as it is connected to a Np235 t-case. Rolling around on Nitto 42x15.50 with Hostile 22" wheels. It has 5:13 gears with Arb air lockers front/rear and a Arb onboard air setup. Blinged out Kc light bar King speed billet everywhere on the motor! This one is far from complete; you know when it is we will have a full write up and photo dump!! In the meantime, as always... thank you for having us along for the ride!

"Very Very helpful and was a smooth transition.   Thank you" says CPR on Google
08/10/2026

"Very Very helpful and was a smooth transition. Thank you" says CPR on Google

★★★★★ Very Very helpful and was a smooth transition. Thank you

 we love seeing where and in what our engines end up! These surface tracked drill rigs run our 4BTA130HP and are the Swi...
08/07/2026

we love seeing where and in what our engines end up! These surface tracked drill rigs run our 4BTA130HP and are the Swiss army knife of the industry. If you need a repower or a replacement for your industrial application, give us a call #720-920-9162

Is Engine Bay Friday a thing? We  sure feel it should be...Because we think they are Sexy!!
07/10/2026

Is Engine Bay Friday a thing? We sure feel it should be...Because we think they are Sexy!!

"Really great experience, Big Bear Engines was extremely knowledgeable and shipped out my engine the same day as the ord...
07/08/2026

"Really great experience, Big Bear Engines was extremely knowledgeable and shipped out my engine the same day as the order was placed! Highly recommend!" says Luke on Google

★★★★★ Really great experience, Big Bear Engines was extremely knowledgeable and shipped out my engine the same day as the order was placed! Highly recommend!

Address

18540 Apache Drive #160
Parker, CO
80134

Opening Hours

Monday 7:30am - 4:30pm
Tuesday 7:30am - 4:30pm
Wednesday 7:30am - 4:30pm
Thursday 7:30am - 4:30pm
Friday 7:30am - 4:30pm

Telephone

(720) 920-9162

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