SKU: 2357836110

Swap Block Mock Up Cummins 3.9 4BT Engine Block | GF-EJ-CUMMINS-4BT

Sale price$161.51 Regular price$179.46
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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8

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Description

Swap Block Mock Up Cummins 3.9 4BT Engine Block | GF-EJ-CUMMINS-4BTEngine: Cummins 3. 9 4BT Years: 1989 1998 Our patent pending tab and slot version of the mock up block provides accurate mounting positions of engine accessories and bolt ons. Weighs only 26 lbs This unique design is lightweight and comes disassembled for ease of shipping and storage. Precision formed returns on all weight bearing components and tight tolerance slots create a rigid and accurate representation of the Cummins 4BT 3. 9L engine block

  • Engine: Cummins 3.9 4BT
  • Years: 1989-1998
  • Our patent-pending tab-and-slot version of the mock up block provides accurate mounting positions of engine accessories and bolt-ons.
  • Weighs only 26 lbs
  • This unique design is lightweight and comes disassembled for ease of shipping and storage.
  • Precision formed returns on all weight-bearing components and tight tolerance slots create a rigid and accurate representation of the Cummins 4BT 3.9L engine block compared to bolt-together types.
  • One tool accomplishes accurate placement of a 4BT Cummins engine into the chassis build of your choice.
  • Easily positioned by hand, the days of slinging an engine on a crane in and out of your build are over.
  • It's designed to bolt to your transmission while also permitting the attachment of oil pan, motor mounts, header, front timing cover, oil filter housing, and intake.
  • Save time and money and work more safely.
  • Durable steel construction resists heat from welding, so unlike foam blocks, custom motor mounts can be fabricated right on the block.
  • Comes with hardware for exhaust, motor mounts, bellhousing, oil pan, and timing cover.

NOTE: The 4BT was used in commercial vehicles and industrial applications, so some variations to bolt patterns may be seen.?

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 2357836110

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4.8 ★★★★★
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Robert
Grantham, US
★★★★★ 5
Fit my Subaru Forester perfectly!
This fit my 2024 Subaru Forester perfectly. The filters exhibited a high quality construction and was packaged well. Installation was easy and saved me a lot of $ vs. having my dealer install an OEM filter.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 16, 2025
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Verified Purchase
Jeremiah
Carnegie, US
★★★★★ 5
Good Fit
I don’t expect this filter to last as long as the original filter but that’s okay because it is about half the cost. It looks well made. I didn’t see any flaws. I chose this filter because it had some of the fewest complaints regarding the fit and it worked well for my ‘23 Subaru Forester. I may go back to an OEM filter next time but it’s nice to know that this one will work for me.
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Reviewed in the United States on April 30, 2026
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Verified Purchase
John Appleseed
Dallas, US
★★★★★ 5
Fits as advertised
Good item
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Reviewed in the United States on May 11, 2026
J
Verified Purchase
Just Joe
Fort Morgan, US
★★★★★ 4
Don't spend $50 at the shop, do it yourself.
Filter fits as it should. Good price for what feels line a quality part.
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Reviewed in the United States on January 4, 2026
S
Verified Purchase
Shane605
Massapequa, US
★★★★★ 5
DIY
Good price and fit my 2018 subaru crosstrek. Saved money switching it out myself. Super easy to do it yourself
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Reviewed in the United States on February 15, 2026

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