Our story

Over 30 years of metal fabrication, wielding, and machine work, with emphasis on automotive and manufactoring industries. Currenlty working on various projects including 42004u.com. To bring a custom ride experience for all 4200 motors and all GM Atlas engine families including the GM355 chassis.

Mission Statement

H.E.A.T | High Efficiency Auto Technology
Machine, weld, and fabricate efficient designs into hi-performance parts. Giving you quality and personal service.
Is a welding, metal fabrication and automotive parts shop devoted to creation of custom parts for your 4200 platform.
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About Us
42004U is owned by fabricator Francisco Thomen, who has over 30 years of experience in custom metal fabrication and hot rod customization. We are open for commissions or collaborations to bring your project to life or to meet your business needs. *No job is too small.
Address
1621 Julesse Ave Suite B SACRAMENTO CA 95818 USA
Contact