HAND-BUILT DIESEL POWER
FFS 12V ENGINE SERIES
Signature 12-valve Cummins long blocks — hand-assembled, tested, and fully warrantied. Every long block is spec'd for brutal reliability and no-compromise performance. You can customize your Engine to get the power you need.
Tested
Hand-Built
Warrantied
WHAT'S INCLUDED
EVERY BUILD INCLUDES
No corners cut, no surprises. Here's exactly what comes with every long block that leaves our shop — built right, tested hard, and shipped ready to run.
01
Tested Performance
Every long block is tested for power and reliability before it ever leaves the building.
02
Hand-Built Quality
Assembled by experienced diesel techs — not slapped together on a mass-production line.
03
Fresh OEM & Upgraded Components
New bearings, gaskets, and seals — plus upgraded internals where applicable for extra headroom.
04
Nationwide Shipping & Crating
Securely crated and shipped straight to your door or shop, anywhere in the country.
05
Installation Support
Got questions during the install? Our tech support line has your installer's back every step of the way.
OUR WARRANTY PROMISE
WARRANTY YOU CAN TRUST
We stand behind every engine we build. When it's done right the first time, backing it up is easy — that's the confidence that comes with hand-built quality.
12-Month / 12,000-Mile Limited Warranty
Every long block is covered against manufacturing defects and workmanship issues from the day it ships. If something isn't right because of how it was built, we make it right.
WHAT'S COVERED
Internal engine components against manufacturing defects
Workmanship defects on all assembly and machining
Technical support throughout your install and break-in
WHAT'S NOT COVERED
Normal wear items and routine maintenance parts
Improper installation or failure to follow break-in procedures
Modifications or tuning beyond our published spec
12 MONTHS
12,000 MILES
LIMITED WARRANTY
12 MONTHS
12,000 MILES
LIMITED WARRANTY
12-Month / 12,000-Mile Limited Warranty
Every long block is covered against manufacturing defects and workmanship issues from the day it ships. If something isn't right because of how it was built, we make it right.
WHAT'S COVERED
Internal engine components against manufacturing defects
Workmanship defects on all assembly and machining
Technical support throughout your install and break-in
WHAT'S NOT COVERED
Normal wear items and routine maintenance parts
Improper installation or failure to follow break-in procedures
Modifications or tuning beyond our published spec
THE ENGINE LINEUP
SIGNATURE 12-VALVE LONG BLOCKS
Every long block is hand-built by our team, dyno-tested for brutal reliability, and backed by our warranty. Pick your build and tap through to the full spec sheet.
STRAIGHT ANSWERS
GOT QUESTIONS?
Everything you need to know before you order a long block. Still stumped? Reach out — real builders, real answers.
Every long block ships freshly built and dyno-tested before it ever leaves the shop. That means all-new bearings, gaskets, and seals, precision-machined internals, and a full break-in verification. It's all backed by our 12-month / 12,000-mile warranty so you can drop it in with confidence.
Yes — our builds run on a core exchange. A refundable core charge is added at checkout, and once we receive your old block back in rebuildable condition, that charge is refunded in full. Ship your core in the same crate your new engine arrives in and you're all set.
Typical lead time runs 2–4 weeks depending on current order volume and your spec. We don't cut corners to hit a deadline — every engine gets the full build-and-test process. Once it's ready, we crate it securely and ship nationwide, freight to your door.
The warranty covers internal components and workmanship defects — the stuff we built and machined. It does not cover normal wear items, or damage caused by improper installation, tuning, or abuse. Install it right, run it right, and we stand behind our work.
Absolutely — custom is what we do best. Bigger injectors, stroker cranks, upgraded valvetrain, whatever your application calls for. Hit us through the Custom Build Inquiry form or email us your specs and one of our builders will spec it out with you personally.
We've got your back. Our team offers phone and email tech support for professional installers and DIY customers alike. Got a question mid-swap? Give us a call — we'd rather talk you through it than have you guess.
BUILT TO YOUR SPEC
NEED A CUSTOM BUILD?
Don't see exactly what you're after? Talk to us. Send over your specs, your application, and your timeline, and one of our engine builders will get back to you personally to spec out a long block built the way you need it — no middlemen, no runaround.
Real builders. Real answers. Usually within one business day.