The May 2026 issue of Diesel World brings serious horsepower, real world builds, and the kind of stories that remind you why diesel never goes out of style. This month’s cover truck, Frisco, is Greg’s one off R2.8 powered IH Scout that proves creativity and craftsmanship still win every time. Inside, you will find everything from Seventy 2 Fast, the newest diesel competition with huge cash payouts, to Blue Collar Blue, a daily driven GMT800 that shows you do not need a trailer to turn heads. Dark Duramax highlights Phat Phabz stepping into the diesel game, while Where Experience Shows breaks down a squarebody Duramax swap done the right way without shortcuts.
There is plenty of action beyond the builds as well, with event coverage from Mother Road Mayhem and the 717 Outlaws show. Tech readers will appreciate hands on solutions like saving CP4 Cummins trucks, cleaning up the classics with a Fleece Performance fuel block off plate, and dialing in sound control for a quieter ride. With Reader Rides, fresh product highlights, and a mix of classic iron and modern power, this issue delivers a strong balance of inspiration and practical knowledge that diesel fans can actually use.
ARTICLES IN THIS ISSUE
Below is a selection of articles in Diesel World May 2026.
ONE TURBO, ONE SHOT SEVENTY2FAST LEVELS THE DIESEL DRAG RACING FIELD
Seventy2Fast is a high-stakes, invite-only diesel drag racing class at UCC, featuring equal rules, big payouts, and knockout competition that rewards real performance over excuses.
A SQUAREBODY DURAMAX SWAP DONE WITHOUT SHORTCUTS
This 1987 Chevrolet R20 Duramax swap, built by DMAXStore, stands out as a refined, fully functional build, combining performance, practicality, and thoughtful engineering rather than flashy or overdone modifications.
MOTHER ROAD MAYHEM TRUCK SHOW 2025
The 2025 Mother Road Mayhem tested trucks, vendors, and spectators with challenging weather, as organizers prepared extensively, reinforcing its reputation as a tough, exciting event with a loyal following.
FRISCO – GREG HERREN'S 1969 INTERNATIONAL HARVESTER SCOUT 800A
Greg Herren, a builder of 55 years, created the 1969 Scout 800A “FRISCO” as a rare personal project, dedicating it to his late father, honoring his legacy and railroad career.
THE MITCHELL ROBINSON EDITION F-350
NBA player Mitchell Robinson owns a custom 2021 Ford F-350, expertly built by Christopher Varner, showcasing refined taste and top-tier craftsmanship matching his on-court performance.
717 OUTLAWS 6TH ANNUAL TRUCK & AUTO SHOW
The 717 Outlaws 2025 event drew 400–500 vehicles, offering competitions and family activities while honoring local veterans, with proceeds supporting homeless veterans across Pennsylvania.
Mike hodge
Clean layout, solid articles on diesel performance.
Nov 17, 2025
Ashley R
Fantastic coverage of diesel builds and power mods.!
Nov 17, 2025
Larry Vasquez
Good magazine
Nov 13, 2025